#2 Easy route
No matter which way you look at things, going to the WWE as opposed to re-signing with the UFC was the easiest route for Brock Lesnar to take. The travel isn't as bad as it used to be, there's less risk of permanent or serious injury, the money is great and there's no lengthy training camps that need to be endured for Lesnar.
You can say that he's a bit of a coward because of that, but you'd be wrong.
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Just look at the guy's track record. After years of literally putting his life on the line in search of success, doesn't he deserve to go down the easy road as opposed to making things a little bit harder for himself?
Professional wrestling was an industry that he was extremely familiar with, and he knew that he could probably maintain some form of creative control over his character development. A good move all round.
We conclude with something that was vital for Brock's progression.