A 4.00 FIP would not be a 5th starter. Well, if it was, it would be a nice 5th starter. That's a 3 in a bad rotation or a 4 in a solid rotation.
Well, a contextual 4.00 FIP, including park effects. A park-adjusted FIP of 4.00 would be a 4/5 yeah, but I think he'll be better than that.