Hey glad to finally join this active Spurs fan forum!
In my opinion, Pop kinda has his hands tied behind his back with RJ and Blair. I think he feels that if he benches them, he will lose what little value they bring to the table. I feel that they are not mentally strong players, and will not be able to play an important role off of the bench.
That still does not explain why Bonner gets as much bench minutes as Tiago, however. Can't really jump the gun yet, though. Tiago just played a of a game and has had a day to rest. Let's see if he increases his minutes tomorrow night, and if he doesn't, then we can really jump his ass

.
GO SPURS GO!