As a GB fan, it depresses me to say it but I agree with daveinzambia about Cav's chances. I could be wrong but, other than MSR 2009, I can't think of any other major one day race of any significant distance where Cav has survived to the finish. His survival that day was a big surprise and he didn't have the profile then that he does now. His other major wins have really come in stage races where the top one day racers and teams don't lay it all one the line for that one day. I just can't see Cav surviving and, even if he does, from the video of the course, that uphill finish is too tough - he'll be out-muscled. So to stay on topic, as others have said, if Cav can't survive, query whether Renshaw would either.
Goss is a different kind of rider to Cav. He has the power to go with the bursts near the end and duke it out with the classics riders (see MSR 2011). Cav doesn't (see Cwlth Games race).