#4 Because Nakamura is moving to RAW
Shortly before Clash of Champions last night, the WWE confirmed the much-rumored draft between RAW and SmackDown Live. The draft, which fans have speculated on for a while, will effectively see the rosters of both brands be locked down and could see anyone move between shows.
If WWE wants to give fans a nice big surprise, moving Nakamura to RAW would definitely do that, though it'd also mean moving the Intercontinental Title. Since joining the main roster in 2017, the King of Strong Style has been exclusively a SmackDown Live Superstar, and a shift to the red brand could be a breath of fresh air for the former Royal Rumble winner's career.
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In response, WWE could move over the United States title, currently held by AJ Styles to the blue brand. This would certainly give a new level of interest to the shows, especially with the draft happening shortly after SmackDown moves to FOX on October 4. Though he's been a team blue player all his main roster career, it could be time for the King of Strong Style to turn red.