There were fewer Phantoms and people at the Lower Ring than at the Upper Ring, yet it was still a huge number of people, millions.
How did all the Phantoms know about each other then? How did reputations spread?
It was quite simple, apart from the city streets and arenas, the only place the Phantoms could go to demonstrate their strength was the Cave Grid.
The Phantoms at the Lower Ring were much more accurate than those at the Upper Ring. The Cave Grid was huge, but in the end, it was caves, not the expanses of the Dead Lands. The chances of Phantom squads crossing each other were too high.
It was almost impossible to kill someone or do something remarkable and go unnoticed. As soon as something happened, someone saw it and the news spread like wildfire throughout the Lower Ring, first reaching the Phantoms then the common people.