Although, I've got no idea why Roberts threw him in the meaningless 162 game to begin with. I'd have kept him as a potential bullpen arm. The Reds are gonna be though out in a 3-game series.
if i had to guess it was partially just out of respect to let him finish the season on his own terms, knock one more W onto the list. he's also been dominant in seattle, so that probably figured into it a little.