Everyone on your roster gets to dress for bowl games, but their redshirt will be pulled ("burned" is a misnomer, because like TerryP said, players are not designated as redshirts until after the season, and if you don't use your redshirt in one season you can use it in the next).
And if McCarron is the 2nd-string QB, which he was the last I remember, you don't hesitate about playing him. As great as the program is looking, and what an awesome job Coach Saban has done, you still don't know for sure when this opportunity will come again.