New information about Samehada
We see that samehada has probably an soul... Kisame can also heal and replenish his chakra by taking some of Samehada's chakra by momentarily fusing with, or fuse all the way to further increasing his power and also his shark like appearence. Samehada's hilt is able to stretch and bend, allowing Kisame to swing it at his targets like a flail. During his fight with Killer Bee, Kisame unraveled the bandages around the blade to reveal Samehada's true form: the scales grew longer and opened outwards, the hilt elongated itself, and the weapon opened a razor-teethed mouth at the end. Samehada is noted to be in a pleasant state while engorged with copious amounts of chakra, and can even evade attacks. The chakra it absorbs can heal what are otherwise fatal wounds, and can be used to give the recipient near limitless stamina. Kisame can also fuse with Samehada to turn into his true form which gives him a shark appearance.
Currently - i dont think killerbee has a chance to win this fight but we will see