It depends on what you mean by athlete. For instance, even in shaqs prime he was far from the center that could run the fastest or jump the highest. If that's all you mean by athlete than I really don't know. Nobody really does except for the players, and I'm not up on where gortat's vertical or 40 speeds are right now.
But, how many of those guys are 280, 7ft? How many have shown a consistent ability to switch in a pick and roll and cover a guard for a split second, then get back to his own man with the same quickness when the defense adjusts? How many have shown the ability to block shots without fouling(a pretty substantial task), which means they have the body control to keep their mass centered, and keep their spacing intact? How many have the strength to guard the biggest centers but the quickness to guard the quicker ones?
Like I said, at 7ft 280, that's pretty [dang] athletic.