I'm not gonna bother with Lady's post because of how much of a troll post it is, but I'll answer the above:
Nope, never said such a thing. Just saying Kisame has never used that technique to start a fight. He didn't use it vs Gai when he was in the ocean and wouldn't have even needed prep, he didn't use it against Bee and Bee's friend whose name I forget when he started that fight. Only time in this manga he's used that technique is when the opponent has shown they could kill him if he doesn't use it.
Kisame needs Samehada to go with that technique. He uses fusion to move like a fish underwater. Without samehada he's like a normal human. Also he didn't know Bee was that strong. Water dome is Kisame's trump card that he won't use unless he's in a handicap, or the opponent is too strong too beat in the conventional way. He didn't need prep time.
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Water dome is actually a one shot technique when it comes to the trio of Tsunade, Kakashi(without ms), and Sakura
It would be no different than me saying "Kamui gg" and ending the conversation there. #1 That's stupid and no fun and #2 Kakashi doesn't do "kamui gg" under practically any situation.
I'm not talking about in the technique.
I don't recall Katsuyu being shown to scale in comparison when summoned at 10%, but Tsunade summoning her by herself in part 1 summoned a Katsuyu the size of Bunta(if not bigger), who is the same size(or roughly so) as the 1 tails. If 10% of Katsuyu isn't big enough to break that water dome, she can at least get in his way while the others escape.
10% katsuya is still tiny compared to the dome. A bijuu size Raccoon was like an ant in it. 10% isn't that much bigger than a bijuu. Also the dome moves with Kisame. Kisame can sense chakra in Samehada mode. He can sense them if they try to get out, but they're too slow underwater to get out.
The dome moves with Kisame, but if they go in different directions(Ala Bee and his friend), he can only follow one.
People in the dome are sitting ducks compared to Kisame. They won't be getting out without getting blitzed and getting their chakra sucked out in an instant.
No. He can get one of them. The other two will escape.
The other two won't be escaping him. If they do by chance then they could do nothing about him. They have to enter the dome to hit him, which would be suicide.