I think he will be able to contribute as much as Lopez this year if not more. If his is really as healthy as he says he could even play some PF. Man that guy has some small calves!
http://www.nba.com/suns/video/2012/08/15/ONealPhotoShootwmv-2186957
http://www.nba.com/suns/video/2012/08/15/ONealPhotoShootwmv-2186957