Opening day is just one game. As we get into the last two weeks of ST I would think Rocco will be looking at the first three series of the season and try to set up the rotation to give us the best match-ups against KC, Miami, and Houston that he can. His preference for who should start which games will determine the rotation and, working back from that, who will start on opening day. At least that's how I think it should be done. Taking that approach means the opening day starter will be in that role almost by default, so to me, as Brock said, it's not real important or significant.