I have a theory that Roy Dismey's actually far more dangerous and cunning than we realize
>is so fast his movements can't be tracked, he stole Charlie and Pim's stuff out of the pockets without them even noticing and left the building at near-imperceptible speed to the point even Charlie couldn't catch him
>pretends to be stupid but actually influences the direction of the conversation via clever manipulation to appear more innocent than he actually is ("because I was just uh, I was over there for a second and uh, boogley goo" - he wasn't actually "over there for a second", he was pickpocketing his supposed "friends")
>he almost revealed his identity and plan but chose not to because he knew Alan already knew and wanted to taunt him ("I was thinking I wanted to tell you uhhhhh....okay goodbye")
He's going to be the main villain of season 4, watch them reveal it at the end of s3