So basically, what you're saying is a ten year old child made an account in 2016 then abandoned it. Then three years later after being banned, he decides that instead of using the Trex account he's going to make dozens of alts and generally bug the shit out of everyone. Then, he apparently has the foresight to decide "Oh I guess this isn't working", dig up an account from when he was 10, change his entire mannerism and get about 70% better at not acting like an illiterate child literally overnight, and not manage to screw up and get banned immediately. Keep in mind Serpent is 13 years old. If Serpent is Trex, then good on him. He sure fooled literally everyone else on the forums and Discord.
I think you are putting far to much stock in a literal child's abilities. Furthermore, I think you aren't giving enough credit to the admins. They are very good at this kind of thing. They catch people all the time. And as funny as this is, I don't think asking every noob that joins "Who's going to rape Clifford in your next story" is a particularly good idea. Also, about Trex's defensiveness, you literally accused him of being a 13 year old child who has a rape fetish. I'd probably be defensive too.
But hey. According to Discord, I'm just Serpent.