#3 Limited move set
While the idea of Brock Lesnar being in a Royal Rumble match might sound exciting on paper, it becomes less so when you consider what actually takes place during these types of matches. Beyond that, when you consider the amount of time and athleticism it takes to complete a Royal Rumble, it seems outright ridiculous for Lesnar to last long.
If nothing else, competing in the Royal Rumble involves telling a story, and Brock Lesnar's limited move set and heelish nature is only going to further that story so much. Sure, the company can have him go Suplex City on every Superstar that enters that ring, but the fans are going to be more focused on his eventual limitation or win.
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That's why WWE needs to take a good look at their hand and realize that Lesnar is not capable of telling a 40, 50 or an hour long story inside the ring. In all honesty, his personality and his limited storytelling abilities are Lesnar's two biggest drawbacks and they would be on full display if WWE had him go long.