#5 Benefited - AJ Styles and Roman Reigns

Throughout the brand split, Styles has been the top face on SmackDown while Reigns was the top dog on Raw.
While Reigns didn't always hold the top prize on Raw, he was always challenging for it or about to challenge for it. It was inevitable.
And once Mr McMahon realized just how great Styles actually was, he was booked as the top guy on the blue brand with two long reigns as WWE Champion.
Since each man had feuded with practically every superstar on their respective shows, short of turning one of them into a heel, the best thing to do was to have them switch places during the shake-up.
That's exactly what happened and now, each man will have the chance to forge their paths on new shows and have new and exciting feuds.
They may not become champions right away but it's only a matter of time before each man is challenging the respective champions on their new shows.
While Styles likely has to battle with Rollins for top face supremacy, it's the rest of the top faces on SmackDown that will likely have to suffer once 'the Chairman' decides he wants to put the WWE Championship back around the waist of the Big Dog.