f4p wrote:to me, its also just math. realistically, how big is the talent pool for a sport that is barely televised and where the money is such that you are probably going to need an offseason job unless you are a very good player and are definitely going to need a career after basketball unless you are a very, very good player? part of the reason a league expands is because it thinks there is money to be made, which is based on how popular the sport has become, which almost certainly feeds into how big the talent pool is. now, american sports seem to have decided that 30-32 teams is about the cap of what they can do so we have seen less team expansion but enormous "per player" monetary expansion, which draws in even more talent, and gets them training from a younger age because you have to beat out so many more people and just having fun through your high school years will result in your being left behind. there's no reason to think the talent hasn't probably far outstripped the tripling/quadrupling of teams from jerry west's day. so the first 25 years of the nba (1/3 of the years) probably doesn't even represent 1/10 of the total talent. it could be even more extreme than that, though i don't think it grew quite so fast in the 70's or early 80's.
I think those are all reasonable thoughts on the 'total talent'.
I do have some initial thoughts that push me back towards the 'oldies' even with similar thoughts (though I think slightly more conservative than you on how much the talent pool has expanded):
-The top end stars (guys being considered here and probably for most of the top 100) were likely attracted to the league notably more quickly than the average talent (for financial reasons), somewhat similar to how Euro superstars almost always come over to the NBA now while more middling talents may stay in Europe. Those are the types of players we'll be talking about in the Top 100, not the average.
-The most recent ~20% of talent is probably seen as ineligible for a spot this high for many voters based on longevity more than level of play, that's what you'll get with half careers. Giannis/Jokic/others very may well pass this tier, but folks may not feel they've done so yet.
-I think the 60's quartet gets a hurt by looking at direct cut-offs like 'the first 25 years' vs a little more broadly. They may be 4 of the top 5 of the first 25 years (with Mikan), but they may also be 4 of the top 6-8 of the first 40 years (adding KAJ and maybe DrJ/Moses). And at that level of talent/success/whatever rarity I do think the distribution is pretty heavily determined by randomness, and there just happened to be a heavy concentration that arrived with Wilt/Oscar/West in a 2 year period, imo.