Billy Botch or William Koch? Of all the pitchers on the staff, Koch has the highest upside. At his best, he's better than anyone we have. Problem is Billy Botch is a solid AA relief pitcher.
If we have most of our roster back, we're in the thick of the race again and need reliability and if we can trade for a 25 man roster type of guy, I'd move him.
If we are in some between year thing, keep him and hope he comes around to his old form and dump him at the trade deadline to a contender who's desperate and willing to overpay.