He's been dealing with "real injuries" since 2015 - lacerated kidney, abdominal tear, torn shoulder labrum, concussion(s), the general wear and tear of the position...this leg injury that had kept him out since spring just wasn't healing, and it ended up being the final straw. I would rather have him walk away now than to try and limp through the season without being fully committed. Makes me think of Favre's final season in Minny when they had to beg him to come back and then he sucked because it was obvious that he really didn't want to be there.