dark and light team always have advantage on player side

dark character do 148% damage to light enemy, but takes 75% damage from light enemy.
light character do 148% damage to dark enemy, but takes 75% damage from dark enemy.

light and dark team have no elemental disadvantage in terms of damage. the only disadvantaged situation is using dark team vs dark enemy, or light team vs light enemy, because debuff application rate has heavy penalty for same element situation.