Not only did his teammates see him sag and melt under pressure in that game, his opponents did and fed off of it, and the rest of the NFL players who watched it as fans saw it.
He’s toast. My prediction is that he will be a serviceable quarterback, but he will never be great. He is going to get injured, and is always going to have excuses why he isn’t taking the next step. I wouldn’t be surprised to hear him eventually play the race card.
Because every coach, and every linebacker, all the way down to HS Freshman Squad, knows he can be rattled. Badly. And they'll be gunning for him.