i'd argue that kareem is #2 since you can really only compare gueys relative to their era
#1 or #2 in PER every year for his first TWELVE years in the league (9 years at #1)
that's crazy
the problem with kareem is that everyone remembers him AFTER those 12 years when he was still great but getting old and not nearly the rebounder or defender he had been....the mid-late 70's was a shit era in the nba but the nba was loaded with talent for his first several years...and he dominated