The difference between college and the NFL is greater then between a bama and a mid-tier school IMO. Either way, it's not as consistent. You don't play bama every week.
You're right, teams don't play Bama every week. But the option has existed in college football for years. Shouldn't there be some history of QBs getting injured running the college in option?
Or does it boil down to being hit constantly with NFL force?
How many big hits did Kaepernick take last year?
How about Manziel? Mariota?