Among the many insufficiencies on this team presently, Davis is about as far down the list as I can imagine. He was an excellent acquisition last offseason. While he does not pose the intimidation that Chapman did, I believe the Cubs have a better closer in Davis.
Your clean-inning point seems pretty accurate. It seems, in a situation like last night, he needs to take things to the edge of the cliff before he knuckles down and finishes.