Yeah, the walk to the pitcher had nothing to do with figuring him out.
Still, my key point is that I don't think it's really been a collapse in the 5th inning because "collapse" implies that he's been good in innings 1-4. I don't think he has been. I think he's gotten by in the first four innings, but that's been mostly good luck that he's kept teams off the board early in the game.