Most of the teams I've seen focus on konoha ninjas while using Iruka, WB Asuma, and a barrier ninja that hits the main. Ik someone posted a forum about recommended lineups here. In terms of group summon, the general feel I have seen has been ninjas that give a leech effect to the lineup (Scarlet Blaze, Midnight Blade, and Guy) at early levels to keep the team healthy. But with enough tank stats then the leech becomes irrelevant. I also haven't tested to see how much adding Yamato helps the damage output but from what I've heard is he doesn't do much.