Greenbull has a sword & sunglasses. Doesn't look like Zoro.
Luffy denied Yamato's request to join. He tells Yamato at the party that being oneself is a requirement for personal freedom and he only wants to sail with people that are free in their choices
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I made Luffy denying Yamato's request up.
You're dumb if you believed that Oda can write character development it in the first place.
If you want Characters to go through character arcs and grow, don't read one piece.