So, 3 of the best 14 seasons of all time come from '60s. Is not strange for you? Golden era...
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To be fair, Russell, Wilt, Oscar, and West dominated the league like few others have ever done. West and Oscar had better than Jordanesque relative to their peers at guard (each other excluded), no forward even came close, and Wilt and Russell dominated West, Oscar and everyone else more than any players to ever play. There are questions about era strength, but the 60s was pretty clearly stronger than the expansion, selfish play for contracts, and growth of the cocaine culture that characterized the 70s and into the early 80s and after that it is at least arguable that the 60s are stronger than the late 80s or 90s though it's a minority opinion. So, that individual dominance is unprecedented and should produce unprecedented results.
I think once the big 4 are in, you will wait a while for the next 60s year (Elgin . . . Pettit will go in from the 50s and Havlicek from the 70s), quite probably not even making the top 50.
That said, having read the other submissions and checking them against my own impressions and prejudices but without statistical analysis, I rank the next three:
Curry 16 -- GOAT offensive regular season puts this above 17.
West 66 -- Hard for me to put Oscar over West when West + Baylor is consistent NBA finalist while Oscar + Lucas (who I am pretty high on) is not a lot stronger than a .500 team over their time together. OScar was healthier and more of an ironman, West had a tendency to just explode in the playoffs.
OScar 64 -- The one year his individual brilliance in Cincinnati led to team success; just (of course) ran into the Russell Celtics.