To start with, kisame beat B, who already manhandled sasuke. Kisame is kage tier and can handle a full jinjuriki. Sasuke at this point is not kage level, getting his sasanoo broken and melted by the raikage/mizukage. But kisame also has been itachi's partner for a long time now, he knows the sharingan by now and how to fight it. Kisame wins high diff at worst
That'd what I'm saying. I made a post a few weeks ago asking at what point they thought Sasuke became Kage level, and most of them said at the beginning of Shippuden.