#2 Kevin Owens
For every bit the performer Sami Zayn is, his best friend Kevin Owens matches him in almost every regard. Kevin, in this case however, is a better fit than Sami. Kevin brings in a history with the Intercontinental title and animosity against Rollins. Along with that, given the opportunity, Kevin Owens is one of the best all-round performers WWE has to offer.
Rollins and Owens were frequent foes during the latter's Universal Championship reign through 2016. However that feud only showed sparks, and now it is time to ignite the flames.
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If WWE chooses to go down this path, they have a lot to offer. They can play up how Kevin never really beat Rollins clean, as Chris Jericho or Triple H were always there to help.
This could lead to the kind of Owens we saw in NXT, who would just beat opponents senseless. They can keep it light-hearted and entertaining, as Owens' dry and sarcastic humor tends to get him over well.
The dynamics of a feud between these two will always generate buzz and excitement, as they are two of the finest performers on the WWE roster today and are so supremely talented that they can take this feud in whatever direction they want to.