Or at least, the group would generally listen to Kisame's orders in battle, because he's better at strategy and because the Byakugan is as close as a ninja will get to a good strategic view of the battlefield.  Miya's just pushy and doesn't like waiting around, plus she's probably used to taking point, and everyone knows the marching order after so many years capturing lost cats together.<br/><br/>Raikou may be quite a curveball for the group dynamics, though.