#1. Shinsuke Nakamura

Out of everyone on this list, the only fair trade seems to be Shinsuke Nakamura. While Braun Strowman and Bray Wyatt are the two top names on SmackDown now (with Roman Reigns being out of action indefinitely), it doesn't make sense for either of the two to switch brands.
Shinsuke Nakamura, on the other hand, could have an interesting run on RAW. He's been with SmackDown for three years since his debut and hasn't changed brands once, being in the same category as Carmella.
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While he hasn't achieved the same success as AJ Styles, nor is he viewed that way by the higher-ups, he could have a surprisingly good run in the Red brand. Normally, fans are quick to assume that a RAW Superstar going to SmackDown will be instantly beneficial, but many cases over the last few years have proved that the opposite could be true as well.
Even if he isn't a World Champion on RAW, he could be a top challenger or at the very least, an upper midcarder.