#2. He should: Daniel Bryan's part-time status will make him a bigger attraction

Three years after his return from retirement, Daniel Bryan is still one of the best wrestlers in the world. Even after feeling "oddly detached" in the main event of WrestleMania, Bryan managed to put on an incredible performance that justified his addition to the match.
The Undertaker is no longer a part-timer, and Goldberg's appearances are far and few in between. Brock Lesnar technically isn't even under a WWE contract, and there is a lack of part-timers. While that isn't a bad thing, Bryan will likely take up that spot - and deservedly so.
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Daniel Bryan will be a more beloved part-timer, and in his role, he is unlikely to win many big matches that he should be losing. The biggest criticism of part-timers is that they take up big spots and get an undeserved win over superstars who work full-time.
With Daniel Bryan, that won't be an issue. The less he wrestles, the more of a spectacle his matches will be.