Well...
1. If Ben claims Sheriff, then we then means Rodger could be lying (or Ben). What are the chances of two Sheriffs in this vault? Luna = Trolling??
2. If he claims Jailor, he has to give a pretty good reason of executing Rachel and proof of jailing someone in N2.
3. If he claims anything else, he pretty much has to give proof. It's easy to lie with the Random Any's in this vault. It would've been easy for Biggs to claim a Town role, too.