'He doesn't want the rock' - really, you've heard him say this? You can see it in his eyes?
Has he 'gotten the rock' early? Has he had more than 10 carries in any of the 4 games this year? I would love to see him get 20+ carries in a game before I decide he's done with football.
And being tackled for loss on a stretch run with no blocking help does not count as - 'he's not the same player'. The blocking isn't there. You notice Brown hasn't exactly exploded on his carries either. Is he also 'done with football'?