I don't know if I'm overrating him but if he can do two things, I want him on the roster: 1. OPS against lefties at a .750 or higher clip, subbing for either Kepler or Rosario on a regular basis 2. Play acceptable defense, something he was able to do until last season according to advanced metrics (lots of SSS here) His career OPS against lefties is .776, which was obviously helped by last season. In 2014/15, he was bad against LHP. In 2013, he was good. SSS for all seasons when you get down to it. Anyway, my thinking is that Grossman doesn't have to be good to help this team, he only needs to fill in for other players' weaknesses and be acceptable in the role. Time will tell whether he can live up to that relatively low standard.