#1 A fresh rivalry
As we have already discussed, Brock Lesnar vs Seth Rollins is nothing we haven't seen before. On the other hand, Kofi Kingston taking on The Beast is something the WWE Universe has yet to witness. Although there are a bunch of us who wouldn't give Kofi a shred of a chance, they should go back and watch Brock's matches with Finn Balor, AJ Styles, and Daniel Bryan.
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Lesnar is capable of having good matches if his opponents are small and agile. Kofi Kingston has proved time and again that he is quite possibly the most exciting high-flyer in the past decade, and has given consistently good matches over the course of his entire career. Not only will this be a fresh rivalry, but we would also get to see Lesnar have a longer match, and a good one at that.