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In the portuguese official version, Luffy also speaks in "plural":
"Vocês" is a term used to adress multiple people.
"Vão" is also used to adress multiple people, Luffy should use "vais" if he only wanted to adress a singular person.
Now, I don't know much about Japanese, but in Portuguese it looks like Luffy adresses both.
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"Vocês" is a term used to adress multiple people.
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"Vão" is also used to adress multiple people, Luffy should use "vais" if he only wanted to adress a singular person.
Now, I don't know much about Japanese, but in Portuguese it looks like Luffy adresses both.
Also he says in first panel "Even being beaten so much nothing works" addressing to both of them.