Just got this random idea that what if after everything with Troy (And after Triangle gets fuccin BEAT UP by him and his crew for reasons), after he's killed, everyone goes back home to rest and eventually heal but then Triangle. He thinks he was stuck with Troy for 2 months. And that's how Noodleneck finds out he has PTSD and head trauma which resulted in him having SEVERE short-term memory issues! Yippeeeee!!
(As in he remembers very certain basic and key moments in his life like meeting Mothra or The Slaughter, but doesn't remember Mothra's name, face, or what she meant to him. Same thing with everyone else, though it varies depending on how important they are to him.)
So then cue everyone pitching in to make a super cool awesome deluxe dlc edition memory notebook for Triangle, complete with scribbles and doodles from Cole and Monkey, and even some from Russel! And then flash forward a few months when the house is almost rebuilt and Triangle regularly writes new and old memories in his multiple journals and uses them to cash in favors or promises that not even Noodleneck can remember lol
He becomes the most menace of all the menaces because of this and no one can say no lest they risk him just forgetting everything again and Triangle fuccin KNOWS THIS. He uses it to his advantage every time and he loves it.