I don't post often fearing getting slammed by the usuals on here but I think this is a great idea, considering what we have to work with. Get both ready to start on that day and depending upon opponent... You could even take it a step farther. Let's say Rodgers hasn't pitched for a while. Start him and in 2nd bring in Happ for three and see how he does. I know this sounds a little crazy, probably will not sit well if sportsmanship or common courtesy is concerned but it would make for some interesting banter? If Happ or whoever gets a slight advantage L/R split, then you can save McGowan and possibly even give our next starters a rest?
OK let me have it but try to be nice.