Minato summoned Gamabunta to help him fight off against the kyuubi.
I think the toads could stand up to 1-4 the toads are very powerful and the buji's are mindless without a host. They would have to hurry the fight because as seen with Bunta Vs Shikaku. Bunta was running low on chakra while Shikaku's was increasing.
Could it be stated that A has more chakra than shikaku.