#2 The Undertaker
The likelihood is that, much like John Cena, The Undertaker will retain his ‘free agent’ status in WWE until the end of his career. That means he can show up when he wants and on whichever brand he likes, simply because he can.
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Ever since the 2016 WWE Draft, the WrestleMania icon has almost exclusively appeared on Raw. Granted, he has made a couple of one-off appearances on SmackDown Live, notably before Survivor Series 2016 and at SmackDown 1000, but the build-up to all of his recent feuds has taken place on Raw.
This year was just the third time in 29 years that “The Deadman” has not participated at WrestleMania. Instead, he appeared the following night on Raw, where he interrupted Elias and hit him with his trademark Tombstone Piledriver, presumably to set up a match between the two at WWE’s next Saudi Arabia show in June.
If that is indeed the case, then we are likely to see ‘Taker switch over to SmackDown Live to promote his match against WWE’s resident guitarist.