Right in his case, he exposed it when he needed to, and that was on rare occasion. The funny part is that you would be surprised how much of superiority is engrained by behavior, people would underestimate him more than one time which really surprised me, it was like his actions where able to turn off instinctual safeguards, so even when someone logically knew he was sandbagging, they would still get all the cues that, they had the upper hand. He would trap people with habitual and natural interaction with him, you may go a year with him playing dumb (simple is a better word for it) and you get lulled into the routine off it, then when needed he became shrewd. With people that he was not in an adversarial relationship with, he just assumed the manner as his default manner. So it was not totally manipulative. As he said, he is a simple guy and likes to use the simple part of his brain, but can draw on the rest when needed. In a way, it was not fake, hence my not being able to detect it. I am usually very good at detecting people that are putting up fronts.