And honestly, why I wish the coaches would have held off. The defense softens up a lot in the coming weeks, so if Mike White or Joe Flacco or Chris Streveler have success, it's hard to know if it's because they're better than Zach or just in a better spot (playing weaker defenses).
That's why I REALLY thought Zach would get at least one more start, even if he was on a short leash and liable to get pulled mid-game if he wasn't doing well.
The fact that they pulled him before giving him one last shot tells me that the coaches were worried about losing the locker room... which is bad since it means the locker room isn't in his corner or behind him.