Arizona lost Ambriz (to the
Twins Indians) and picked Zack Kroenke (from the Yankees), a lefty AAA reliever with good stuff and command problems.
It seems like an insignificant move, but like the Scherzer/Jackson deal it's very much ERA driven.
Ambriz started the year in AA and pitched well enough to be promoted after 5 starts. In AAA, he had a FIP of 3.8, but a ridiculous BABIP (.372) and strand rate raised his ERA to 5.57.
Kroenke, meanwhile, had a FIP of 3.64 but a sparkling 1.99 ERA thanks to a .251 BABIP.
I'm not complaining here, it seems we have a lot of starters similar to Ambriz in our system, and Kroenke may be a better fit, but it kinda sucks to root for a team that can't differentiate pitcher talent from BABIP.