#1 Sting
Sting will go down in history as one of WWE's missed opportunities. The man called Sting resisted going to WWE because he was never sure how WWE was going to treat his character. The Invasion angle storyline didn't seem to convince him as he signed with TNA/Impact Wrestling.
For years, WWE tried to court Sting, especially with a dream match with The Undertaker. Still, The Icon never took the bait. WWE had to wait till Survivor Series 2014, where Sting made his debut. This led to a match at WrestleMania 31, where he faced off against Triple H.
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Considering the years that Sting put in defining himself as one of the greatest of all times, his time in WWE was mostly forgettable.
Ironically, it was in a match with Seth Rollins in 2015 at Night of Champions for the WWE Championship, resulted in a career-ending injury. Sting's debut in WWE was probably 10 years too late as the best that Sting had left was in Impact Wrestling.
WWE History might have been different had he taken the plunge years earlier.