#4: Triple Threat Vs The Miz and Daniel Bryan
Of course, the WWE may want to tease keeping The Miz and Daniel Bryan away from one-on-one action for as long as possible, and having them both chase AJ Styles' WWE title belt could be the smartest way to do that.
Daniel Bryan and The Miz hate each other, so it would make sense that they would both do their utmost to prevent the other one from capturing the WWE title.
The Miz holding the belt, and Bryan chasing him makes the most sense, so having a triple threat format means that The Miz can steal the belt right from under Daniel's nose without Bryan having the right to any sort of rematch.
This could also lead to The Miz and Styles feuding after the Summer, while Bryan clum his way back up the ladder to earn a shot at The Miz.