#1. To enter himself into the Universal Championship match

Here is the fundamental problem with Seth Rollins vs Baron Corbin at WWE Stomping Grounds 2019: What on earth will be the main event of the PPV? Sure, Kofi Kingston vs Dolph Ziggler in a steel cage match is a good one, but will it really be that good that it'll interest fans as a main event?
WWE's go-to option, of course, would be to have Roman Reigns main event against Drew McIntyre. However, that would be a bad option and not worthy of the main event. If Bray Wyatt does appear tonight, what if he enters himself into the Universal title match in the last minute?
Not only would it add interest, but it would add star power as well. One could even argue that Rollins vs Wyatt would be a legitimate PPV main event.