So the backup is better....... How do we know this? We know this staff can evaluate players. If they didn't believe based on reps, film sessions and other means that JG was the best option he wouldn't be out there.
If the backup doesn't stand out by those means then he likely isn't going to produce better on the field. Unless you catch lightning in a bottle and end up with some gamer like a Manziel. It can happen but not very likely.
Bottom line is the entire team wasn't prepared to play Saturday. Impossible to put that on one guy as many of you are doing with JG. He was bad yesterday for sure, so were others on the offense, the defense was absolutely atrocious. If he struggles again against BYU then I think you yet another option to spark something.
My concern is that while the offense is fixable with some tweaking incline a possible change at qb, the issue on defense is a personnel issue, we don't have the meat in the middle and zero pass rush with green backers.