If it were up to me, I would option Gibson to make room for Melville and perhaps add a reliever (Boshers I suppose) as the 26th man as he would be eligible in either game. After Monday, Boshers returns to AAA and Melville is optioned to make room for Slegers to start Tuesday. Of course that would mean Gee has to start next Saturday as well. Monday the 27th is an off day that can be used to get the rotation back on track. By the time Sept 1 comes around, rosters expand and the 10 day waiting periods for the guys sent down after the doubleheader will be over. But that's me.