Heyo,

Definitely in such fights you need earth main, since the shields and the ninjas stats will decide the battle. If we are talking about teams that have all the same power and are balanced from the stacks, Six Paths Naruto - Kushina - Earth Main - Killerbee here can really win against another six paths team, since Kushina is extremely tanky herself and you can control naruto, so he won't have an additional leech from his standard attack. There is an additional strategy if you are going for Six Paths Naruto vs Six Paths Naruto that have around the same power and sub stats, which is the Life Recovery. This stat can really decide sometimes the result of the battle and help you win in such situations. Narutos with same stats or anything they fight with same stats do not leech, since they won't deal a lot of damage. This is where the life recovery comes every round, basically just by adding a chakra in the eight inner gates is enough.