I agree totally it would be silly for the Jays to pursue
However, I see why they are considering trading him. They think it will cost a fortune to keep him beyond 2014 and would rather get a young cheaper starter in return plus fill another position of need while they're at it.
That said, I doubt he gets traded. I don't see a team giving them what they want. If Tigers are having a poor 2014 I could see him being moved at the trade deadline though for a lot less.