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I should point out that there's also the possibility of a person who doesn't fight or can't fight at all joining. I know that it would be boring to have such a person be a crewmember, but there is always a chance of that. Of course, there's what profession the person has and whether or not the crew wants that person.
Slightly off-topic speculation: Luffy got the first 4 crewmembers in the East Blue, then another 4 from the first half of the Grandline. Who's to say that he won't get another 4 in the New World?
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