Persuasion should not be on a different char as bartering. Persuasion helps getting stuff cheaper aka selling for a better price, just only a quarter as good as bartering.
In D:OS1 you needed loremaster to check for stuff like Body building and Willpower, the new armour system killed this need. But it is still nice to have to check for resistances and needed for identifying. The forth guy has nothing else to do, so he gets loremaster anyway. It also help to check stats in case of persuasion check.
