I said two months ago for anyone to name 5 better starting defensive centers and no one took me up on it.
In my view, Wallace, O'Neil (only when motivated), J O'Neil (when playing Center) are the only three definite centers better defensively, especially when Rasho is motivated. Yao has the potential as does Daembert (spelling?) of Philly but there are not many others that bring as much defensively as Rasho. Motumbo also on the Rockets for short periods is also stout but he is a reserve.
If he can continue to bring 8-12 points a game and keep this up = he is exactly what Spurs need!