The 3rd tanked a jutsu that destroys on the cellular level and got back up like he felt nothing. Do you really think a couple of swords are going to do anything? He's also much faster than any of them, so their swords are pretty much rendered useless since they won't hit him.The bolt sword, the Chakra sword, the helm splitter and samehada should be able to do some damage and maybe even the blastsword. If we asume that the Samehada weilder is on par with Kisame and you add in the fact that they can all attack silenty, it wont be as easy for the 3rd to win as you think.
I also never said it would be easy, but I do believe the 3rd would win. Also it's obvious the previous wielder of samehada wasn't anywhere to close to Kisame's level considering Kisame easily killed him.