Eh, I really think they wanted to bring Dieng back/into the team for good, not only for last season's possible run, especially considering his long/good relationship with RC. But seeing that he went to a contending team, it's far easier to imagine he looked at Atlanta's team and recent playoff run, and then looked at the Spurs' projected roster for next season... And thought to himself, RC hasn't helped Africa enough for me to make such a sacrifice, after all