My friend came up with this and I think its pretty good.
The Shield keep teasing a break up over the next few months until finally at the Rumble they split. Next night on Raw they get back together. At EC PPV they split again only this time Rollins and Ambrose attack Reigns.
For the next few weeks on Raw they attack Reigns and cut promos about how he became the big star in the group and how it was never meant to be about just one guy. A couple of weeks before Wrestlemania they are beating down Reigns for the fourth week running and IF YA SMELL hits. The Rock runs down and helps his cousin, Roman Reigns. A tag match is announced for Mania 30.
Dean Ambrose and Seth Rollins vs Roman Reigns and The Rock.
Perfect way to get over Reigns (and the opposing team) by mixing with The Rock and it can protect Dwayne if he is concerned about injuries.