The problem with Tiago is purely offensive but the problem is so glaring that it makes him hard to get minutes. I don't see a reason to pair him with the starters at all because he'd bog down the offense so an incredible degree. Even Blair, who has no jumper and is much smaller, is far more effective at getting buckets than Tiago.
I mean really think about it. What does Splitter provide on the offensive end that another big doesn't? Dice and Bonner space much better. Blair is a much better interior finisher (so is Dice - Bonner at the moment isn't any worse). Dice and Blair can run the pick and roll but so can Duncan. Blair can be a beast on the offensive glass. What reason is there to pair him with the starters?
I'm fairly sure its mostly mental. He's just trying too damn hard. I wish the guy would just settle into being a role player because he's never going to be NBA MVP no matter how many times he won that in Europe. I can't make up my mind if he simply thinks he's much better than he is or if he just wants to show the team he doesn't suck. In any event, neither mindset is good for what we need out of him.
The hype has gotten to Splitter in one way or another and thats bad. I just want a solid big who can board and play some good interior D. Splitter has shown flashes of that and has shown flashes of being a good pick and roll player. Thats all he needs to do.