You don't take into account that Gus murdered Malvo and got away with it and Molly knows: This is your deal…

"How did Gus get away with just shooting an unarmed and injured man"
He lied & told them it was a straight gunfight; that's why he's getting a citation for bravery. Once he had the answer to Malvo's riddle, he figured out the answer to his own question of how someone could be two faced like Malvo; its a survival…