I think it might be the original Rex. He's... been in and out of the pillar like three times. But after he came back from the first time... it was like a different him, so there's still one in the Pillar.
Anyway. [waves a hand idly] Worrying about that kind of thing will only wear you down. Worry more about games after that Trickster one. Whatever happens happens. Not much we can do about it except roll with the punches. Besides, you're probably too stubborn to end up there.