#5 Announces the arrival of a megastar

WrestleMania is a show which gets the dedicated WWE Universe, as well as mainstream audience, who are wowed by the glitz and glamour of the show.
The show could also be a great way to introduce the signing of a megastar to WWE. The last big-name star to debut in the WWE was Ronda Rousey, and that signing was over a year ago, at last year's Royal Rumble in January.
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While we've had quite a few talented NXT stars making the big jump to the main roster, we haven't had a big name from another promotion or from another sport arrive to the WWE.
One name that we could have speculated if he hadn't signed for AEW is Kenny Omega. But with his name ruled out, we aren't sure which big-name pro wrestler the WWE could sign. Perhaps we could see a sportsperson from another sport make the switch to WWE, much like how Ronda Rousey did over a year ago.