It's certainly fair to criticize May's demotion but I don't think any harm has been done by "jerking" him around. Adam Wainwright made zero relief appearances in the St Louis farm system. In 2006, Adam Wainwright made only relief appearances for the Cardinals. From 2007-2014, Adam Wainwright made zero relief appearances for the Cardinals. Adam Wainwright seemed to do just fine for himself. As long as May is on the MLB team and helping the team win, he's learning something. Could he learn more from starting and bring greater value to the team in the long run? Yeah, I think so... But I'm not terribly concerned about the team jerking him around. May seems to have a good head on his shoulders and he's getting half a million dollars to play baseball. Is he mildly irritated he isn't in the rotation? Yeah, probably, any good athlete has an ego... But I doubt he lets it bother him too much. He has a job to do and he seems to relish in doing it, as evidenced by his increased velocity and strikeout rate as a reliever.