Like I said, they're most likely just a scan hologram of the gang. Cuz it doesn't matter in a sence who is in the tubes, because you could have gone to the ocean palace, then escaped and got another member, came back etc.
Zeal is pretty technological, like how the Black Omen has those laser guards. I'm pretty sure that could scan you. And also, when you go down the stares in the Ocean Palace, you fight those soldiers, who might have reported you or something, or those weird statues took a copy of you.
Magus isn't an intruder because the Queen trusts him.
And Zeal doesn't seem like a cloney civilization. That theory is just as bad as the Zealians dying their hair rumour.