I doubt he can work his way back into the starting rotation. He's absolutely not taking a fri/sat spot. Only chance would be taking Glenn's place Sunday, and he hasn't been doing bad at all for a Sunday starter. Mccune could give the pen a huge spark though. If he returns close to form he can provide the perfect long relief we would ever need if NOLA/eades/Glenn get into a bind early.
No way can I see him breaking into the bullpen against No. 10 Kentucky. Most likely he gets extended innings in the mid week games and then becomes a pen factor in the second half of SEC play. Only if Glenn Implodes do we see him battle with Reynolds and maybe Bonvillain for a Sunday spot, still really unlikely in my opinion.