Jimmy has been awful. Supporting case, NFL-readyness....none of it matters. He has been bad, and they should take the elite QB prospect. It's not like they took Clausen in the top 10 last year or anything like that, you can afford to move on from a 2nd round pick if you can potentially replace him with an elite prospect.
And in addition, like I already pointed out, he has shown no flashes of potential. No big plays to give you a preview of what might be to come....his best highlights are completed checkdowns.