The quiet killer lurking for the rotation is the IP limit they're bound to hit with Horton and Brown. I generally agree that a TOR guy probably won't happen in this market, but they're going to need good enough arms either to spell Horton and Brown to keep them fresh for September/October, or to pick up the slack when they get moved to the bullpen or shut down late in the season.
Maybe there are internal solutions with guys like Assad and Birdsell, but a rotation of Shota/Boyd/Rea isn't going far in the playoffs.