#9 Keiji Mutoh/The Great Muta
Since Sting has now retired following two WWE matches, The Great Muta now earns the title for the greatest non-WWE wrestler to have never wrestled in a WWE ring (or at least, the one about whom fans knew enough to want to see him in a WWE ring).
Muta/Mutoh is widely considered to be the greatest Japanese wrestler to have ever performed in the United States. From his fantastic rivalries with the likes of Sting and Ric Flair in WCW in the late 1980s and early 1990s, to his creation of the ever-popular Shining Wizard and Muta Lock, Mutoh’s influence remains visible in WWE even though he hasn’t wrestled in Vince’s company himself.
A former WWE writer just went after JBL for his comments HERE
That’s not to say he didn’t want to; he was reported to have wanted to do so in the early 2000s, but a no-compete clause in his WCW contract prevented him from doing so, and by the time he started discussing the matter with Vince McMahon a few years later, he was the president of AJPW and no longer had any interest in performing stateside.
Muta is now 54 years old and his body is incredibly worn-down (if you think the Undertaker’s body is in bad shape, just take a look at Muta). Even if there was an opening for someone to act as a trainer or as a mentor for younger talent (Muta is widely considered to be a master of ring psychology, and would, therefore, have a lot of wisdom to pass on to younger wrestlers), the barriers created by language and physical distance between Muta and WWE would make any potential signing impossible.