The players on the team have no faith in him...he outplayed Anderson by a lot in the pre-season and they don't even want to think about giving him the nod week one. That tells me less about Leinart's play, but more about the faith the staff, and moreso his teammates have in him and about what they think of Leinart, regardless of his actual play...
Looks like he isn't a well liked team mate and the staff that inherited him wasn't and isn't a fan. Heck, it was reported in Coach Wiz's first season he wasn't a fan of Leinart, so, this turn of events shocks me none.