It has nothing to do with this preseason game. I've been saying this for months, even when people were saying he wouldn't get drafted, I told them they were insane.
He has more raw physical talent than just about any QB in the NFL. He has, without question, the strongest arm in the NFL and he runs a 4.4 40 yd. And he does so at 6'5 235 lbs. That alone is going to put him on NFL franchises for years to come. He is simply oozing with talent.
What will decide his fate between being a career back-up and a starting caliber QB is his accuracy and decision making ability. From a decision making standpoint, he was pretty good in college. Not outstanding by any means, but he made the correct read the vast majority of the time and did a good job not turning the ball over. His main issue was accuracy and touch, which never really saw any significant improvement.