#1. Brock Lesnar needs Paul Heyman more than Roman Reigns
Paul Heyman and Roman Reigns have had a mutually beneficial relationship for several years. Heyman has helped Reigns become the biggest star in WWE, and Reigns has given Heyman a seat at the table and picked him back up after Lesnar left the company.
That being said, Roman Reigns doesn't need Heyman anymore. He's the biggest star in the company, has the Championship, and can now deliver on the mic like no one else in the company.
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Brock Lesnar, on the other hand, needs Heyman at his side to be at full strength. Without Heyman, he has become a likable character but not a contender for the title. It was clear last week when Heyman forced him to awaken The Beast that it's Heyman who holds the keys to Lesnar.
Not knowing it, handing Heyman back over to Brock Lesnar could have been Reigns' biggest mistake, because Lesnar will now become The Beast Incarnate that Reigns has struggled to surpass several times in his career.