What did momo mean but 2 voices left??

i think it's Kaido and Luffy?? they were the only people left on the top floor,,

Yes but it is weird the way he phrased it

maybe he has haki like how coby unlocked it in the war or that girl in skypiea

this may be a clue of how he can hear the voice of all things better than anybody in Wano cuz he's the rightful heir or idk just saying