It seems like McDyess plays well with whoever he's matched up with. He can stay down low when Bonner's in the game and operates at the perimeter pretty well too with his jumper. It seems like he's the only one they really go to on the pick and pop.
Also, no disrespect to Blair, but McDyess seems to do a much better job on post defense, regardless to the type of player he's defending.
Bonner plays well with Duncan and Dice. Bonner and Blair leave the frontcourt weak on defense.
Blair with Duncan seems to me, kinda crowded. It's almost like Tim has to go out of his way to make room for Blair, especially on offense. Blair works with Dice, but still not the strongest combo the Spurs could have in the frontcourt. I don't know how a Blair/Tiago would work out at this point.
I do think Tiago/Tim, Tiago/Dice, and Tiago/Bonner would probably do fine.
I personally would like to see Tiago in Blair's spot, with McDyess and Bonner continuing to fill the role they're currently playing. Blair's a good player but I don't really see where he's a step up from Tiago, other than possibly knowing the system better.
This all of course coming from a McDyess homer.