at the very start of the nomad faction ... weren t the nomad NPCs considered to be "lost ones" or so? ( cause the reputation couldn t be easily fixed for the nomad player ) - so that would aim at "there can be more than one nomad clan"
that aside... whats the point of it when you get down to it. - would another nomad faction have different faction goals than the existing one? - nomads are not exactly multifascetted creates when it comes to multilayer thinking... they are more sturdy working at a unified goal.