Ya ever had back surgery? I see an all-pro prior to surgery and an average player after. Just what a doctor might expect. or, it could be lack of effort as you suggest. though I see nothing in Rivera's history to suggest that he in any way is a sandbagger. In fact, up to signing with us he'd been singled out as an excellent leader and a mentor for young linemen. Us scientists always say the simplest solution is usually correct. So which is a simpler solution? Back injury = poor play. Or complete and total change in character = poor play?