It is painful to watch how good he is and not see him here, taking a turn every 5th day. But this season is about conditioning. 6 innings or 85 pitches may be his limit in order to stretch his innings into September. They probably do view minor league innings as less stressful than majors, and really think that, developmentally, if he were brought up now, his 15 -20 MLB starts would not stretch into September. I'm guessing the plan for him is to have him make 30 - 35 starts this year at all levels. The stint in the minors is almost like extra spring training and conditioning.