I think most are underestimating or understating how much 'luck' is involved in constructing a good bullpen. I also don't give a f*** what they did with the pen in 2018 - in fact, I applaud them for not spending resources on the pen then when this team was nowhere near ready to contend.
As the team moved into it's window to win, the FO has added Cimber, Richards, Garcia, Phelps and Merryweather. Outside of Cimber, these guys all have a ton of swing and miss stuff with K/9 over 9 and then you have our internal guys like Romano, Mayza and Pearson. Unfortunately, a lot of these guys aren't performing up to their abilities right now.
You can bitch all you want that the FO 'should have known' Pearson and Merryweather are made of glass and can't be relied upon, but let's be honest, most pitchers are ticking time bombs.