User blog comment:GoDai/GoDai's Translations: T.U.S., Exis, and Phantaminum (Pentaminum)/@comment-107.2.152.16-20120627064902

I have a theory.

The boy in TUS that was cleaning the outside of the tower got into the TOG as an irregular. He became known as Urek Mazino and after exploring the tower he now wants to get back out.

TUS supposedly took place 200 years before TOG: thats plenty of time for Urek (who climbed the tower in 50 years) to get to where he is now strength and influence-wise (as a comparison Yuri became a high ranker after only 100 years). If Urek was that kid outside the tower it could also explain Urek's desire to leave the TOG.