If the Bills appear to be more careful about injury management, I think it's because they are playing the long game & want to be as close to 100% in the post-season as possible.
In one way, this works out best for Tua if he walks away He was never going to win a ring in this league, but now he can play ‘what if’; what if he hadn’t suffered concussions.? He can make a whole new career in football if he plays his cards right.