It is his choice right now. He (and the whole football world) knows what could happen.
I will bring up (once again) what bugs me some. How does Tua's opponents handle this?
Nobody wants to be the guy to give him another concussion, but these defenders have a job to do.
Every defense wants to "rough up" the opposing QB and get him worried about throwing the ball.
Will they be treated differently because of Tua's situation?
How much more extra "protection" will the officials give him?
One can even see that this puts and added level of worry to the Miami Dolphins OL.
None of them want to be the guy to miss a block and get Tua's bell rung again.
It is for sure Tua's decision, but it affects a lot of other people too.