I picked Izzy because I still think he has the ability to get batters out late. He was good all the way up until he got his surgery. He might be old, but he can still get the job done.
Balfour Has the stuff to be a closer, but I don't think Maddon agrees with me.
Wheeler should stick to being a set up man he is good at it.
Percy should split saves with Izzy because they will both be hurt at some point.