Against the yankees, he was over throwing his cutter/splitter and it lost movement and became a second fastball.
Without the change in speed and late break, he becomes very hittable. Against the Yankees, I think he was too amped up and he let his emotion affect his mechanics.
This is not the first time this has happened to him. But when he comes out of the pen, he seems to be riding on adrenaline and not emotion.
So why doesn’t Cora use him out of the pen? He could be a shut down 7th and/or 8th inning guy, who can get us to cardiac Kimbrel !
Baseball is simple game, it is only the people in it that complicate things.