Through last year, he was a guy who was relying on good walk rates and a string of what seemed to be unsustainably low BABip numbers for his above average seasons. This year, the walk rates inexplicably climbed to unacceptable levels and BABip deserted him at the same time. So, if they think the control issues are correctable, you can probably treat him as somebody likely to post a 3.50 ERA in middle relief, which is valuable. That they are fully versed in the fickleness of BABip and didn't pick up the option suggests they don't think it's likely they can fix the control problems.