I say pair off and have at it. The more 'experienced' characters in CQC can face off and the lesser two can practice slapping each other. In the real world the only way to learn to fight is to actually do it. Sometimes getting your ass kicked by a more experienced fighter will teach you things you won't learn otherwise.

For instance Rilla IRL probably has much less actual fight training and fights than I have. It shows in our realistic matches, but he is learning and getting better at realistic fighting.