now the question is, do you start him on your fantasy team
Regardless of how he's slumped, you start Unit every time he's on the bump. You just do. In my book, at least. Guys like Santana, Clemens, Oswalt, Pedro, etc. you have them on your team to start 35 times; it's what you draft/trade for them for. To make managing easier. One less player you have to consider benching here and there.