I think I'd take my chance with Vitor and Iverson this season as the backup centers (but they better acquire someone better to start!)
Kristic wasn't a horrible player, but the value he had was on offense. He was a pretty p----poor defender and rebounder, and really - what I want from the backup centers is defense, rebounding, and six hard fouls.
If he isn't traded, KO will probably still get a few minutes as the de-facto 5, too.
Not sure there's a spot for a guy like Kristic, who's not good enough to really make a difference in the present and certainly isn't part of the future.