Say what you will about him, and Derek will, Edric shows up in chapter 8. The Guild Navigator does not give an inch during his discussion with Paul. All this happens with the face dancer watching pleasantly from behind the tank. We see a Paul Atreides who is surrounded on all fronts. As he dismisses the exterior enemies, he has to confront the interior enemies Korba and Irulan. This is why we have Bannerjee.