It just doesn't make sense this year; @Jason Ross broke it down pretty good.
Also, he's never been a reliever for the Cubs. I remember him coming in one game for MB, but they used LHRP Chase Watkins as opener, for some reason, and I think Wiggins came in the 3rd inning. If I remember correctly he wasn't very good that game.
I'd put him on the Horton path. If he can stack 4-8 good starts next year in Iowa, he'll be starting early next year for Chicago.