JJ had a ~3.80 ERA last year, didn't he? Factor in the rough half a run adjustment, it's worrisome.
I still want to keep JJ, for whatever it's worth. Want that regression.
I think the main concerns were his transition to the ALE and a smaller park, and his injury history. Both have been significant issues for him this year. He's also having a stupidly unlucky year, but they were legitimate concerns.
"The Jays pulled DeRosa off waivers the moment he was claimed, underlining the value the classy veteran infielder has brought to the club in a troubled season." http://www.thestar.com/sports/baseball/2013/08/09/blue_jays_veteran_mark_derosa_has_winning_attitude.html
This f***ing team