#4 Competing/appearing in NXT
Brock Lesnar may have come up through WWE developmental, but he's never performed in NXT.
NXT has been the hottest brand in professional wrestling for a long time. It was originally created as a competition show to find WWE's next breakout star, but it went on to become the company's developmental territory, which showcases the Superstars of tomorrow.
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Even after the black and gold brand replaced FCW (Florida Championship Wrestling) as WWE's development brand, many big names still appeared on the show. Former world champions Chris Jericho, Randy Orton, Batista, Sheamus and Rob Van Dam have all wrestled in NXT.
Even 'The Leader of the Cenation' John Cena appeared in NXT in 2013 while he was the WWE Champion. This tells us that NXT is also capable of holding even the biggest Superstars in WWE - even one as huge as Brock Lesnar.
Another huge name that fans wouldn't mind seeing on the show is former Universal Champion Brock Lesnar. Matt Riddle took multiple shots at Lesnar and even stated multiple times that he will retire The Beast.
It would've been awesome if Brock Lesnar made a surprise appearance on NXT and attacked Riddle with an F5. Even though Matt Riddle is now a SmackDown competitor, it'll still be a great moment to see Brock in NXT one day and he could confront another upcoming star such as Keith Lee.