Oh, the only reason the Nomads DIDN'T reveal themselves straight off, was not tactical or strategic, just based simply on the fact that the full force of the House navies would roll right over them, as stated in vanilla FL missions... (Can't remember which one). If the Nomads attacked straight out, even with the Planetkiller Mothership, humanity would have most certainly flattened them... That is provided they don't infiltrate far mind you...
