You may be onto something. After all, trust is the reason he benched George Hill last year, when it was obvious to everyone on this board that the kid was the right answer at the backup PG position. In fact, he went onto bench Hill during the season - even after that prolonged stint, where he started in place of an injured Parker at the beginning of the season, for about a 2-3 week stretch, and more than held his own. He simply trusted Jacque Vaughn more, even though he was the inferior player. Of course, by the time Pop elected to go back to Hill, the season was over, as the Spurs were going down to the Mavs in that playoff series.
He screwed around with Beno in the same way - even though Beno was clearly better than a raggedy Nick Van Exel. That meltdown Beno had in the 2005 NBA finals sealed his fate with Pop. Of course, in Beno's case he didn't do the work to maintain Pop's trust. However, it was very interesting that after Beno was traded, Pop admitted that he handled his development the wrong way.
He's repeating the same stubborn mistake with Ian, too. If he doesn't allow this kid to continue developing in this organization, he will have screwed up another key personnel move - a la Scola. I thought he would've learned his lesson by now. I don't understand why Pop is allowing his ego and stubborn pride to intervene. This is checkers, it aint chess. This shouldn't be a hard call to make.