Someone correct me if I'm wrong, or if not and you know where to find the article, please post. I seem to remember reading months ago in some article that JC looked good in practice, but one or more of the receivers commented that, IN PRACTICE, Jon was slower to make reads and therefore to pull the trigger on a throw than Nick. When you don't see something quickly or hesitate to pass, esp. in the SEC, the passing window is gone.
In my opinion, Kiffin knows JC sucks, but uses him to put off the blame. There are some idiots who think we have no one better to run the offense, but Nick is 4 of 4 this year, granted against WKU, but with my high school experience I could go out there and look as bad as Crompton. I could turn the wrong way on play action passes, overthrow, underthrow, throw the ball away for no reason (I know he has done this wisely a few times, but also unnecessarya few times), fall down for losses, fumble, throw to the other team, and yes I have full faith that I could make one decent throw out of 20 as well.
Lastly, who cares how someone looks in practice. Do I need to remind you that practice is practice, it doesn't count, ask Allen Iverson. There aren't TV cameras and tens of thousands of fans to turn Crompton into a nutcase.