I do think the value of a starter over a reliever is overstated in the short term, such as half a season or less. This is especially true when he was not a clear upgrade over a handful of starts. Certainly massively more upside, but not clear he would have outperformed the rest of the year. Development is nice, but winning is even better. The blunder, as stated, was putting him back in the bullpen in 2016, or at the very least not moving him to rotation soon after it was evident it was a lost season (so, week 2).