#4 Brock Lesnar
It might seem surprising to see Brock Lesnar's name on this list, but he is someone who could be so much more valuable on SmackDown than he is on Raw.
For one thing, his presence draws ratings. If WWE wants to bridge the gap between the two shows, having Lesnar appear only on Tuesday nights would be a big step in the right direction.
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Another reason Lesnar moving to SmackDown would make sense is the various possible feuds he could have. Nakamura and AJ Styles are two names he has yet to face in a WWE ring, and both would help him produce better matches than we have seen from him in years.
Some WWE fans may not realise Nakamura lost to Lesnar in New Japan Pro Wrestling over nine years ago, so The King of Strong Style would have an established reason to feud with Lesnar.