After this year he'd be 4 seasons removed from being a starter, and wasn't even particularly good at it in the minors.
Biagini on the other hand was still a starter when the Jays took him in the rule 5 draft, was trending upwards a starter at AA, and was only used as a pen arm to satisfy his rule 5 requirements. He very likely would have been starting last year at some point had the health of the Jays rotation not been so freakishly good.