My conclusion is a football opinion. It's business, not personal.
Let's compare him to another pretty good QB at Ohio state. Krenzel I believe his name was. That guy was tough. He took a ton of hits in the pocket (Bollman's guys were a little leaky), but he ran the ball when he had to - and did quite well. But I saw him take some hits where I was like, "He's not getting up from that", but he would roll over, pop up, and head back to the huddle. Off the top of my head, I don't remember him coming out for even a play. With the beating he took, you know that he had sore knees and ankles, pain in his back and neck, and it had to hurt in his shoulders, elbows, and wrists - but he never missed a game beginning with the Michigan game of Tressel's first year.
I have a feeling that if we had Craig over for a barbeque and got a few beers in him, he would have some things to say about Braxton learning how to suck it up and stay out there.
All that said, if he's hurt, he shouldn't play. But he has put himself in the situation where we are unsure. Just because he gets taken to the hospital doesn't mean that he is seriously hurt. No matter how you spin it, that's a problem.