Luck's recovery is taking so much longer than anyone seems to have expected, that I don't know that he can be counted on to be the same player he was before. He and Tannehill have been injured for almost the exact same length of time, but RT has been throwing the football (and well) for a long time. If Luck can't throw, then he can't play QB. He's already been talking about being a different player who uses his mind more than his arm when he comes back.