If kisame is fused with samehada because kisame can absorb chakra on its own. It even stole samehadas when it ran away against its will, implying he can absorb chakra at a faster rate so fuses that'd be 12 tails + of chakra with a touch.. Which is believable by how fast he drained ALL of bees and gyukisCan it affect Susano'o? Yes. Can it counter Susano'o? No.