#2. AJ Styles
AJ Styles was an integral part of SmackDown Live from the re-introduction of the brand split in 2016. He was the face of the blue brand throughout and two WWE Championship victories and several great feuds and matches later, he finally made a long-anticipated move to RAW.
It was the right move because he had essentially done all there was to do on the blue brand. With RAW being a fresh start, he was instantly shot up to main event level (as always) and is now contending for the Universal Championship.
Fans drowned out a popular wrestler with 'She's a racist' chants recently
Similarly, Roman Reigns has been a RAW guy throughout and since WWE wants to put the biggest stars possible to make the Wild Card rule seem unpredictable, AJ Styles might just have one more small trip to SmackDown Live.
What his role would be, we don't know, but it's certainlg going to be interesting to find out.