Writers' Blog
Maddie:
Because Brawn is, like, brawny

Or whatever

EDIT: Also wow Brawn is really super attractive right now??????

Josh:
Hey, remember how Sebastian was stuck in a cave for a long time and we don't know why, but he couldn't really do much training?

Well Brawn was still adventuring that whole time and he's kind of spectacular because of it.

Artists' Blog
Max:
If this adventuring business doesn't pan out, Brawn could always find work as a door-stopper.