He totally should do it. Many slaves would probably joined him of their free will, and some of them looked pretty strong. Voila, party ready without help of the douche aristocracy and definitely stronger than the other dork heroes since he was not incompetent at hero job and trained Raphtalia sucessfully.
Btw he was also a pedo, since she might look adult but she physically grown in like few weeks and was still a kid.
I stopped after they did away with the princess, but after not seeing logical conclusion of the entire affair (guillotine) my disappointment was immense and my day was ruined.
Putting john brown in anything would make it good. Doubt me? Star wars sequels, but john brown instead of rey. Boom. Indiana Jones but the main is john brown. Boom again. All anime, but john brown is in it.