Hey, Roman Reigns is perhaps the most protected superstar in WWE right now. It would not surprise me at all to see him put on a classic with Strowman and then pin him with a spear. Reigns may be the only superstar in the roster who may be allowed to defeat Braun Strowman in such a manner. To be honest, this isn't even a bad option.
You would want your Universal Champion to look strong in his first outing. A clean victory may be the right way to achieve this.