#4 Roman Reigns
According to the rumour mill, Brock Lesnar only retained his Universal Championship to go on and have a feud with Bobby Lashley. The two MMA stars are due for a fight going forward. This would effectively remove Roman Reigns from the Universal Championship picture. In which case, Reigns could challenge for the second most important WWE title!
Reigns has been the Intercontinental Champion in the near past. He was a great Intercontinental Champion too, defending his title on a weekly basis. Much like Ambrose, Reigns too has worked some great matches with Rollins.
There's a big chance that The Big Dog could be next in line for the Intercontinental Championship. We certainly would not mind seeing the two WWE mega stars slug it out in the ring once more.