Because lightning main adds nothing to it. Yagura damage is heavy ninjutsu oriented so using anbu special tactics, the only buff mb may give him, is close to be useless, since, de facto, gives him just the leaching effect. Look at 3rd team garv suggested. That one lands the same damage that mb team you faced landed but endures twice as much and who cares if azure fang is not immune, kushina applies poison the same and honestly speaking azure fang endures way better the damage than an mb even with root of warrior. The problems the azure fang version owns are exactly the same the mb version would have, since masked man or shisui still hit mb in the same way, but if the enemy is not dead at the end of round 2 believe me that you will prefer by far being azure fang in that case.

P.S. arena is another game. In arena kurama kushina habanero gaara cf is close to be invincibile, use it outside and you land no damage.