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Matt is back on latest chapo ep
(hexbear.net)
while i know it's been made clear he won't just "become the old Matt again", you can tell he's using his big broken brain's neuroplasticity to rewire stuff.
he's basically learning to process language in parts of the brain that don't normally do it. if he's trying to convey more complex ideas he does this kind of word association. it's not grammatically correct obviously but you can tell what he's trying to convey. and then sometimes he'll associate one word with another, poetically, in his "strokes of genius" poem style.
as weird as this sounds it's like he's learning to conversate while peaking on a hallucinogen (this will make sense only to those who have experienced it)
he's still young and incredibly smart i think he will eventually weave these new pathways together into a crazy jumbled mess that works. just like how individuals have lost entire brain regions to trauma and eventually other regions replicate the original function.
compared to his first appearance on the show (post incident) though he's recovered amazingly
you will never get the old Matt back, but a new one will be reborn!! 
(i am just a wistful hypothesizing nerdy girl please if i'm way off base or this seems ableist let me know)
