To what extent do tight-knit teams adjust their interpretation of confidence levels on an individual basis to reflect their ratio? Like, "Overconfident Oscar expressed a tiny bit of doubt, so he must not really have high conviction at all." Or, "Underconfident Uma expressed slightly more conviction than usual, so we should pay attention."
Also, from my experience, it seems like (and this isn't a strong opinion) doing competitive high school debate teams turns people into Overconfident Oscars.