You missed the point. You keep saying, "If I was his teammate, this is how I would feel", but have you actually tried looking at the situation from his POV? Say to yourself, "I am in line to make millions in the next year, provided I stay healthy"... and you would still risk injury in the name of.... brotherhood? Really?
OK. From his POV:
1. I don't know that I'm not actually hurting my draft stock by not playing. It is an opportunity to have a big game.
2. I am invincible, man. I'm friggin' Superman. I don't play scared. And, hell, more guys get hurt in training than in games anyway. Not like I'm not gonna train until I've inked a contract.
3. I've fought, suffered and celebrated with this team for 3 years. These are my brothers. I'm gonna be there for them and with them.