#4 To make him appear as a worthy opponent for Seth Rollins

Seth Rollins won Universal Championship at WrestleMania 35 after defeating Brock Lesnar. It has benefitted WWE in many ways. They now have a full-time champion, who is already over with the fans, and an excellent opportunity to boost Raw’s ratings.
Dave Meltzer of Wrestling Observer Newsletter also revealed that WWE is building Corbin up so that he could face Rollins for the Universal Championship. Currently, their match is advertised to happen at Extreme Rules, but we never know if Vince decides to change his plans at the last moment.
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Rollins is the most liked Superstar on Raw, after Becky Lynch, and it is understandable why WWE wants his opponent to get some momentum before starting their rivalry. As of now, Rollins is scheduled to face AJ Styles at Money in the Bank where he will likely retain his Universal Championship.