I'm pretty sure this is a leftover from the beta. Quizen, Skadge, and Torian all suffer from it. In the beta they had different roles, for example you could have Torian use guns, but at some point in time they decided that they each companion needed to have a unique role. Torian and Fess got stuck with new roles that the game didn't quite support. There used to be companion kits which changed their roles, but alas they don't exist anymore.