#3 John Cena

While the Superstar Shakeup is a rumour that hasn't received a lot of traction, there is another method for John Cena to turn up on Monday Night Raw: his status as a free agent.
It seems to have been forgotten since his return, but "The Face That Runs the Place" is indeed a free agent who is free to appear on either Monday Night Raw or Smackdown Live.
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And, the major consensus is that Cena will indeed be appearing on the red brand on the episode following WWE Summerslam 2017. And, it makes sense.
Just like Randy Orton, there isn't much left for him on Smackdown Live and he always seems to have unfinished business against "The Beast Incarnate".
A feud between the former OVW alumni will also add an air of unpredictability as almost everyone expects Lesnar to retain his WWE Universal Championship during his last few encounters.
A top WWE star is missing in action