I'm not even sure if he focuses all that much on his gallery. I got the impression from some conversations with his team that they are mostly responsible for the typings, but I could be wrong. his research definitely focuses on other aspects than celebrity typings. russia/ukraine is more influenced by beta values, and considering that many examples in his gallery are russians, it could just be that it's more difficult to find famous delta examples in their culture. delta is also a quadra that prefers understatement. they simply don't push themselves in the spotlight so everyone can see them. it could also be that he just doesn't find famous deltas all that interesting to type. I certainly don't enjoy watching long videos of SLI's to figure out their type because I find them very uninteresting because of the ITR dynamic. a lot of them have a comfortable technical job and an allotment garden. that's not very interesting to me.
I'm working on my own gallery of types and here's the current distribution:
alpha - 117 examples
beta - 379
gamma - 258
delta - 123
I have 174 IEI examples, and 12 for SLI. the former simply interests me more.
I don't trust any statistics on types. there's barely any agreement here on even the most obvious types and we have a population of 7.6 billion people. how would you even guess the distributions of types? socionics is a field that mostly attracts Ti valuing types, because gamma and delta care about objective knowledge. they need some kind of objective proof so they can trust the theory, which socionics currently cannot provide. Ni is also the function that has a huge interest in psychology. it's the desire to look into someones soul. is it really that surprising that the majority of people who find socionics intersting are beta NF?