The reason we made teams in the first place was to encourage stronger personal relationships between a few characters, instead of having all interaction diluted across the whole RP. Spreading out and mingling during free roam is fine and even envouraged, but during major arcs we should try to stay within our teams. Obviously, there will be arcs where we purposefully mix up the teams, but those will have less of an impact on our characters if we do it too often.