It's an interesting dichotomy. Some guys get nagging injuries like hamstring pulls, sprained ankles, broken fingers, or such. Gronk has had major back surgery multiple times now. You have to start worrying if one more awkward hit and he'll be done altogether or if he will adjust his play to be more conservative to take less damage. I doubt either of those will happen, but I think they carry some concern. As stated many times, any game could be a player's last game, but IMO Gronk has a greater risk of being knocked out for the season than other guys. So while other players might have a 1% chance of going down for the season in any game, Gronk might carry a 10% risk of going on IR. Still unlikely, but definitely a much greater risk.