I noticed that when I introduced JP to the boys. He was very docile and submissive, and as long as the others did not attack, all was well, even with the deep sniffing and touching and such. He allowed it all. The smell mask allows the others to not be aggressive at first as they cannot sense his differing smell. And if they can all end up in a pouch together for a night, then their smells merge and they become more accepting of the scent that he brings to the colony.
I have no doubt that every animal has his own scent, even in a colony, even in a pouch, even after merging.