I don't think Osborne will be drafted, or at least not until very late in the draft. I fully expect him to return next season. Wilborn will be drafted because he is a LHP that throws in the low 90's. Scouts love LHP's that can throw over 90 mph. Rob's draft status will be interesting to watch, because he has three pitches that he throws well. He may have the best opportunity to go higher in the draft.
Several of the fall signees have the ability and the stuff to close, so if Rob does return we may see him remain in the rotation. This fall will be interesting to watch.