it was revealed a month ago that he was actually pitching injured, so that may be why. gonna dig article.
http://www.sportsnet.ca/baseball/mlb/delabar-hopeful-as-jays-relief-search-continues/
"And that leads us to the question many are asking. Exactly what happened to Delabar last year? How does a guy go from being an all-star to being sent down to the minors in mid-June with an ERA close to 5.00, never to return to the big leagues. As it turns out, there was a good reason for his struggles. He was injured.
“I had little nagging things here and there that didn’t require DL time,” he said. “They were more maintainence things and it was a grind from the beginning of the season, all the way through. I’m not one to make excuses so you probably didn’t hear about it until probably just now. For the most part, I just didn’t feel healthy all year.”"