#2 Chris Jericho
Chris Jericho once described leaving WCW and joining WWE as going from black and white to color. And while he said that years after joining WWE, I'm sure that feeling didn't originally last long. In fact, Jericho has admitted he decided to leave WWE in April 2000, just eight months after his debut.
Jericho was convinced to stay, however, after he was told about his 'WWE Championship win' and feud with Triple H. While Jericho did pin Triple H on RAW for the title, it was stricken from the record that same night and rewarded back to The Game that night. Jericho would then go onto feud with Triple H that summer, and things seemed set in stone that this was Jericho's shot at the main event.
It wasn't meant to be at the time, apparently, as despite their Last Man Standing match at Fully Loaded (won by Triple H of course) being one of the best matches of the year, Jericho soon reverted back to mid-card. It has since been publicly revealed that Chris Jericho and Triple H didn't like each other between 2000 and 2003, and this is likely what played into Jericho's fall to the mid-card in 2000 and rose to the main event scene while Triple H was injured for most of 2001.
Charlotte Flair to return and wrestle a CURRENT CHAMPION?
Chris Jericho has since gone on to become one of the greatest performers in WWE and all of wrestling and is a multi-time world champion. He currently plies his trade in AEW and was the inaugural AEW world champion