And Wilt didn't play Bill Russell, as good of a defender at the 5 as anyone to ever play the game?

And back then, there were less teams so you played the good players more often. Wilt played Russell 12 times during the 1962 season

that's like if today you had 3 Bill Russell quality guys in your own conference or if there wee 6 of them waiting for you in the opposite conference
And there were other good centers of the era like Willis Reed, Walt Bellamy, Nate Thurmond, etc. who throughout his career Wilt would match up with countless times.