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They are 2 geniusses who make a conscious decision to be idiots
I like to believe that Gus is a full blown 300 IQ genius because then there'd be a rational explanation to his character conveniently spurting the relevant hyper-specific fact of the moment and he befriended Shawn because game recognises game, Shawn was the only one who could challenge him. Gus is tidy genius and Shawn is chaotic genius.