I thought Joseph's defense was better than either Nando or Mills has provided. In my opinion, neither Mills or De Colo have shown that they deserve to start with Tony out. Mills has been very inconsistent and doesn't run the team well. De Colo doesn't play very good defense, and doesn't score well.
Of course I like both of those guys, and my comments are relative. I think they are both doing a great job, but I think Joseph is the future for the Spurs. I think that either De Colo or Mills will not be with the team in 2 years, but Joseph will.
Dejuan Blair is worse than Matt Bonner!