Sin Cara turning on Kalisto
The Rusev vs. Kalisto feud will apparently run out of gas at Extreme rules. We might get to see Kalisto get an underdog win, or we might get to see Rusev become the new United States champion. Either way, Kalisto is going to need a new feud after the pay-per-view. And who could be a better opponent for Kalisto than Sin Cara.
The tag team is of no relevance at this moment thanks to a star-studded division and the next sensible step from WWE would be to split the team up and let them feud. For this, Sin Cara needs to turn heel at Extreme Rules and if he does, Rusev could move on to a high-profile feud next when Sin Cara and Kalisto could feud for the US title, or simply for the sake of their former friendship.