Now that I think about it, Rock costing Ryback the title is indeed the right way to go. I was trying to recall an example of when this sort of thing has happened before, and I remember it being the finals of the IC Title tournament between Farrooq and Owen Hart, where Austin helped Owen win the belt, only because it was Owen who he wanted to face for the belt (Owen was the one who injured his neck after all), not Farrooq. Similarly, it'd be interesting to see Rock cost Ryback the title because he wants it to be Punk who he takes the title off of.