#4 Strowman squashes Rollins
Remember a recent report about Braun Strowman interrupting a meeting and going on to talk with Vince McMahon for 45 minutes straight about his position in the company? Is this an attempt to try another major push for The Monster Among Men? This finish could mimic the one from SummerSlam 2014, where Brock Lesnar was solidified as a legit monster when he squashed John Cena in the main event of the show.
If someone like Cena can be squashed to put over a monster like Lesnar, there's a slight possibility of WWE wanting to do the same with Rollins, and try a run with Strowman as Champion.
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#3 Rollins wins in a clean fashion
On the other hand, Seth Rollins might take this one, and that too in a clean finish. At WrestleMania 35, Rollins defeated Brock Lesnar, but needed a low blow to slay The Beast. He finally put down Lesnar at SummerSlam 2019 without using nefarious means.
If WWE is seriously looking at Rollins as the face of the company for the next decade or so, they would let him defeat Braun Strowman in a clean fashion, and retain his Universal title. A big win over an intimidating athlete like Strowman, mere a month after defeating Lesnar, would propel Rollins like never before.