To start with, I apologize in advance for my ramblings, because after all said and done, it means little to nothing anyway.
You bring up valid and interesting points, and I'm in agreement with you regarding the Dyckia. I'm on the same page, couldn't add much anything better or more. One just needs to be personally aware of what is what through self-education, and if one wants a particular named plant, use discretion, knowledge, have some knowledge and trust of the seller, and lastly be willing to possibly pay the big bucks. My 'Keswick' came from Eloise Beach, well known Bromeliad grower who bought her 'Keswick' directly from Bill Baker before he passed away. After years, the plant was divided, and years later I guess I wound up with one (Ebay + $$$). It's way different from 2 other supposed 'Keswick' I acquired earlier on, before I realized what was going on with the false use of names on certain hybrids. Mine has divided, but I suspect it's the only one I'll ever get, so I'm naturally timid and reticent at this point in time to mess with it. I'm not taking a saw to it until I'm sure I know what I'm doing, and that I won't cause the plant's demise.
I'm fascinated with the DW Aloe hybrids, but I know the man was also active with Echeveria for example. Aloe were just one of his things. I've tried again and again over the last couple of years to find information regarding the Aloe hybrids, and I've assembled some mental notes from tidbits of information here and there. The most recent was the KG KZ conversation you found where KG talks a bit about DW, and the interesting fact I was not aware of regarding one criteria of selection in his breeding program. KG said that DW used 3 1/4 pots and any plants that extended beyond, he would toss. So, from that, we know he was primarily interested in selecting for miniatures. Also, something I had already surmised on my own, that Aloe descoingsii was a main species behind his crosses, from the comment by KG "his seemed to be highly complex crosses with Aloe descoingsii as the base model and many of his plants still seem to carry that shape."
Also, regarding named hybrids, there appear to be not many, yet I see tons of DW hybrids out there (and sometimes I do wonder if their DW references are legit), from all over the world even, and most seem to be simply designated as "ex Dick Wright", sans name.
Regarding that, there's no book, no registry, no official resource for finding what's what, or what happened - at least beyond lore passed on as anecdotal evidence. Unknown are what records he kept, and what precisely besides miniatures he was breeding/selecting for. But, we do see a plethora of examples as his legacy attributed to him.
I had found one interesting tidbit of info a while back, that he tossed his culls into a canyon out back of his property, and that people visited the area collecting his castoffs, until DW learned of what was happening and began destroying them instead. Which begs the question, how many were collected, how many were collecting them, what became of the plants, and if/when subsequently propagated and distributed - how were they represented (as "DW" hybrid?)? That's just one tangential aspect.
Also, on one of the other threads here where DW was discussed, we saw reference to a person who had bought a nice Aloe hybrid from him, asked for the name, and he said basically to "name it yourself" ! Clearly, if it's our goal to have names attached to distinctive hybrids - we are swimming against the current up some different and significant river forces. In other words, that train has left the station many times over!
I think we have to be satisfied that there are a few out there which have been given names, and are being properly propagated as clones and small-scale distributed in the trade. Also, that the man had one very large influence in the field of Aloe hybrids which continues today. KG refers to Bleck and Wright "these guys were my inspiration for diving in...". Also, we see several of KZ's hybrids with one repeating pollen parent "Aloe 'Paul Hutchison'.
Even regarding say one of DW's most famous creations - the Aloe 'Doran Black', I just purchased another coming from Germany because I want to compare it to 2 others I've acquired. My first came from a grower/collector that I trust, and it seems to match photos on the DW website. The second I bought from a grower in SoCal via Ebay, and I can tell you no way, no how is that the real 'Doran Black'. Yet, someone who really should know better saw fit to dump a bunch out there on Ebay, passing them off as such. Ignorance, or greed? I had ordered 3, and 1 was different in color. Also, they're way too big. Knowing now what I know about DW and the miniatures, anything like this 2nd supposed 'Doran Black' would have wound up in the canyon.
The point is here with even one of his most famous creations, fakes are out there ultimately adding to the sea of misinformation and confusion. Additionally, when I posed the question on it's own thread here "Will the real Doran Black, please stand up?", it gave me further insight that it is not clear what is or what isn't that actual cultivar. Time passes, plants change hands, we don't know what happens, we trust that information provided is accurate, but is it? At the least, given human fallibility, we can simply assume that mistakes happen, and then the result is here and there false information is passed on, creating confusion.
I also saw a thread elsewhere where the advice was given - (paraphrased) "go ask the source". That person already had tried to just get a list of named hybrids from DW, through that website, and although told more than once one would be forthcoming, it did not. That person was left with the impression that they don't care. Who knows? Maybe there's an issue with health, or whether there's the will or resources to continue the nursery, but what is clear is that there is no apparent willingness to share information from the only direct source that would still know. I can corroborate that I sent an inquiry myself through the website about acquiring plants, and I never received a response.
We know that DW's work spanned decades, and we're talking old-school. There was no internet, no forever-saved images of original plants. In regard to that, there was a heyday (if not still in continuation), and that buyers from across the planet would come to Ca to buy large quantities of plants for their own subsequent collecting/propagation programs. I've heard stories. One that impressed on me the phenomenon was relayed to me by a nursery propagator hereabouts regarding Echeveria Ebony that some years ago when those were a super hot commodity, that he witnessed a fist-fight in the parking lot of the nursery between two Korean buyers over which was going to buy a bunch of large Ebony plants @ $500 per. Perhaps a little shook up and shocked, he sold the fight's winner the desired plants. My point is that Korean, Japanese, etc plantsmen/buyers have been coming to Ca for decades buying up plants. I recall reading about Rick Nowakowski (Nature Curiosity Shop) and how many of his Gasteria went overseas over the years. One must assume that they also visited other old-timers, such as DW as well. The bottom line is that the only information we actually know is scattered remnants of stories and information passed on by folks who had connection over the years with what happened way back when.
Although I like having a correct name on a plant, I take it all with a grain of salt (
) now. In the final analysis, one can only try to be diligent in fact-finding and determining what is or isn't within one's own collection, and try to be forthcoming sharing the information when further disseminating those plants. In the end, the plant is whatever it is, the genetics contained within, with a history perhaps lost over the years, but it is either appealing or not, according to the eye of the beholder. It is what it is, and we do what we do. I'm having fun, but I recognize it's a shame that there has been so much done by the trailblazers and pioneers in the field of Aloe hybridizing specifically with the so called "tabletops" that has not been documented, recorded for posterity. Anyway, onward we forge forward into the future, past remembered accurately or not.
There is one clear fact. There are a lot of amazing hybrids out there, something to catch the fancy of anyone, and there seem to be more and more amazing ones coming along all the time. And, there's yet more to be made, and it's far from over. We have the pioneer trailblazers to thank for getting it all in motion, other more current hybridizers who have continued the work, and it would appear a lot of enthusiasts out there as well who I'm sure will come up with more new and interesting stuff over time, from all over the world as it would seem. As I like saying - "It's all good".
Every day, I'm out there pollinating more with what I have available in bloom. Also anxiously inspecting developing seed pods for harvest - I try to cut the stalks after the pods are well developed, but catch them before they split open, easier said than done.
So, I stuck it in water, and took pollen off it every day and used it with an Aloe Viper I happened to have blooming at the same time. Surprisingly, it worked. 
but it seems you left out the greenhouse fire that destroyed much of DW's original collection. That must have been frightening and devastating. It's a shame you can't go visit him and his son at their nursery. As far as I can tell, they take visitors by appt. It's a long way south though.