After watching Blake's interview where he extolled his leadership but remembering just what you point out above, it reminded me of the saying "whistling past the graveyard". Kiffin is doing his best to calm Blake down but he seems to be easily swept up in the moment. I don't know that a QB change would help but poise from the QB goes a long way towards settling everyone in the huddle down--e.g. McElroy at AU on the last drive. If JC has that quiet poise it might be an offset for his lack of knowledge of the system and the step down in mobility that is given up w/o BS.
i know he had a rough game, blake did throw a td pass when we were down 13-7 in the fourth. that showed poise