What is your goal for the season?
Is it a rebuilding season where your only goal is to reach the MWR of your world? If so, then he would be a useful SP4/5 or LRA/B depending on his durability. Are you making a run for the playoffs this season? If so, I would only use him in a MOP/LRB role and he should never throw a pitch in the playoffs.
Depends a little bit on your position player defense and catcher pitch calling. If those are above average he may do a little better than what I said above.