Just to clarify:
2 of your figures on a mat do not double the pot.
(just agreeing with the first responder.)
In the rules this is stated on page 13:
Lone Posse vs. The Rival
If a player has more than one Posse Token on a Mat and no other players have Posse Tokens there, they still must compare hands with the Rival but may only collect the Winner's Pot of a single location once a round.