I think I'm gonna vote Royler too. Like everyone else said, he's mad about losing the last time and he's gonna be training hard to beat Eddie. I'd bet money that he's training extra hard to beat someone using the Rubber Guard, and will have worked out a couple good counters to it.
That being said, it's gonna be close. Both of them are very technical fighters, tops in the world, and it's gonna be great to watch.