Deployment Battles?

Has anyone worked out how much difference it makes just having everyone only deploy each phase and do nothing else?

I'm just asking because my guild got impossible platoons and due to the increase in difficulty have completed a lot less waves and are still going to get at least the same number of stars a last time.

We obviously have improved our rosters but it doesn't look like competing platoons and clearing all the waves actually makes much difference to getting stars.