How did kisame killed the previous owner.You make it sound like Kisame had some epic battle with him.Furthermore, Kisame had Samehada for years, maybe even decades before his fight with Gai;Meaning, Kisame chakra had increase considerably thanks to Samehada.
That's because Kisame had Samehada.
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Kisame killed the previous owner of Samehada under order of Tobi, that's how he got it in the first place, the guy was his sensei or master, not sure
I didn't say he had an epic battle with him either
Nope, you can't increase your chakra pool through Samehada like that. His chakra level were huge from start. Samehada is sentient, it accepted Kisame because he had a large and strong chakra, see how it rejected Guy because his chakra was weaker since he's a Taijutsu master
and that last comment of yours is ridiculous,Mangetsu would be weak two if he didn't have any swords, just like he did in the war. Mastering all 7 swords makes him the most versatile, but Kisame used the same sword for years he's one with the sword, I'm 100% Kisame is better with Samehada than Mangetsu
Ya all make him mastering all 7 swords like a great feat, how can we know if the others could? they never got the chance to wield all 7 to begin with