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Brock Lesnar's 2021-22 run in WWE sparked a lot of controversy throughout the years. He returned in 2021 during the SummerSlam event to start a rivalry with Roman Reigns. This rivalry was planned for the ultimate put over of Roman Reigns as the WWE Universal champion, and later, as the Undisputed WWE Champion.
Roman Reigns defended the WWE Universal Championship against John Cena at SummerSlam 2021. After he managed to defeat John Cena, Brock Lesnar made a surprise appearance and confronted him. After the show went off the air, he beat down John Cena, whose lifeless body was still inside the ring.

Matt Riddle addresses Brock Lesnar as a selfish wrestler
The rivalry went on for a year, and ultimately, Roman Reigns had been victorious over Lesnar. However, this rivalry sparked numerous controversies because Lesnar buried the entire roster just to job to Roman Reigns in the end. It may have been a huge overpush for the Tribal Chief, but an absolutely awful presentation for the rest of the roster.
Brock Lesnar single handedly eliminated every wrestler from men's Elimination Chamber match of 2022 including Riddle
One such dominant performance from Lesnar was booked at the Elimination Chamber 2022, where he single handedly eliminated every participant of the match. One of the participants was Matt Riddle, to remembered this match and called Lesnar selfish. Speaking on TMZ’s “Inside The Ring” podcast, Riddle said the following about this match;

Lesnar recently made a return to WWE after a couple of years
“I’ve worked with Brock (Lesnar) a couple times, and at Elimination Chamber in Saudi, he literally forgot what number he was supposed to come out, punched the plexiglass door, which isn’t super strong. I can kick through it but you’re not supposed to, and then he just bum-rushed. He cut the match by 15 minutes. He’s like, ‘Oh! Sell. F5…’ And Paul Heyman pretended like it didn’t happen. He was like, ‘Oh, that was my mistake,’ and it’s like, no, it wasn’t. It’s f*cking him, dude. He just went into business for himself.”
Another dominant performance of Brock Lesnar was registered during this storyline at Royal Rumble 2022, where he completely decimated the Royal Rumble participants once he entered the match. The men's Royal Rumble match of 2022 is often regarded as the worst Royal Rumble match ever, and one of the biggest reasons behind the failure of this match was the unnecessary dominance of Lesnar.