There's no need for a plate holder; once the portal is open, it stays open, since the only way it will close is when Atheon starts his next phase or minotaurs stand in the plate. There are no minotaurs at that point.
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If all players enter the gate and no one is outside the raid team becomes lost in time and it's a wipe. This mechanic is intended to end the fight when there are three or fewer players left alive, but will be activated any time there are no remaining players in the "present" timeline. It's true that the people fighting the supplicants don't have to worry about losing control of the sync plate, but they still can't all go through the portal at once. I just wanted to clarify that because your post could be misleading to someone who isn't completely familiar with the mechanics of the fight.
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Right, I forgot to mention that those who were thrown into the portal should trade places with those coming in to shoot their Oracles.
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Well maybe not for the plate, but someone needs to be there to kill supplicants.