If you say so
What does zone have anything to do with it. In his first ten years Shaq would have dominated any type of inside defense Or did you see another 7 foot 1, 325 lbs. monster not be able to dominate the paint?:D My point is, zone defense doesn't have anything to do with it. There still are some powerful centers out there. The single difference is that modern centers have developed a jump shot. And there aren't that many teams that play successful zone either... (IMO)
Honestly, I'm not really sure its the zone defense that is hampering "great" centers. I really think its the abundance of other 7-footers/big men to play them defensively. I think if you go back and look at Mikan and Wilt and even more recent centers, they have distinct height and length advantages over their competition. With Shaq, it wasn't so much his height as his mass and strength.