The big thing Bailey did at the start of the season was figure out the best pitch mix for each starter based on which pitches they've had the most success with.
Looks like that had a lot to do with the great start.
But then other teams study what you're doing and adjust to it.
No matter how good the coach is, it comes back to the actual abilities of the pitchers.
Nobody really had much faith in a rotation of Houck, Crawford, Bello, Pivetta and Giolito.