I suspect the Jays were concerned about him struggling during the rehab assignment as a starter, and then having a big issue on what to do with him. I think the first step was to get him back, healthy, and confident. I mean, he's pitched so little in the last few years it isn't funny. Pitchers who throw 200 innings still have occasional problems with mechanics and stuff, let alone one who's thrown about 30 in the last 5 years. The second step (possibly next spring) would be to stretch him out.