Well the advantage of a big PG like Micic is that he can play multiple positions. So if the team were to sign a vet backup PG, then Micic could be depth at both guard spots. I don't think the Spurs will sign a vet backup, though, even if Mills leaves. I think they would have tried to do so this season if they were going to, as they had no idea Mills was going to be as good as he has been. With Ginobili and Beli in the fold for the next season, I think the team will be fine with defender like Joseph. I wouldn't be surprised to see a PG depth chart of Parker, Joseph, Micic and Denmon next season, or maybe I would just prefer it.