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that's the thing, literally speaking the og was Lee Muham and he already reached Nirvana. If we're talking about the Mugos, the og one is cutie patootie mugo, cause he was the first to be born; sassy Mugo is the middle child; and glasses Mugo is the youngest of the group. Currently in the story, the 3 of them have become hyper aware of each other's existence, which means the can't take control over the other as easy as before, cause they can easily swap from one to the other. That's also why we see the sand clock, because they have made a deal of taking turns, and been patient, otherwise itll take a toll ln Jaheon