He'll probably be a top end holds guy with SP eligibility this year (think Wade Davis last year). It sucks compared to the value he could have as a starter, but I wouldn't say he's useless. Over 44.2 innings in the majors, he's held lefties to a .191/.274/.286 line with 54 k's in 44.2 innings (and most of that as a starter, in relief he'll probably average 95 mph instead of topping out there and the numbers will be even better). He still has swing and miss stuff vs righties too (just gives up too many gopher balls).