Wainwright came up in September with expanded rosters and pitched a whopping 2 innings.
I can sort of understand why Jays want Sanchez in the pen, he is already at a career high innings so they want to limit those innings going forward but it makes no sense to call him up to the bigs. He hasn't even dominated the competition in Buffalo yet and most likely he will be sent down since he will inevitably struggle with in the bigs. Let him show you he can at least dominate the competition first, even as a reliever.
If they want to call-up an arm, try Drabek. He will be out of options next year so they have to see what he can do and he has already transitioned to the pen.