As per request, I flew to Omicron Alpha in disguise, trying to find out more about the Outcasts and the so called "Nomads". As you suspected, the Outcasts not only tolerate the Nomads, but they show some sort of reverance towards them. I tried to see how far they would go and I am now certain that, if someone was to attack those "Nomads", the Outcasts would interfere in their defense. This time wasn't the case, given that the "Nomad" itself was the aggressor and it had the capabilities to carry on a battle by itself (as matter of fact, I barely made it out of that encounter), but if things would go differently if the "Nomad" was in danger.