I just wanna point something out about the “pattern,” which I don’t believe in, but to illustrate my point, let’s split the crew into pairs based on a few similarities as to how they joined - two members (Nami and Robin) didn’t officially become Straw Hats until after they’d spent significant time with, and then seemingly betrayed, the rest of the crew; two members (Usopp and Sanji) left by choice and had to be compelled back; two members (Chopper and Franky) didn’t actually wanna join and weren’t asked until their friends begged Luffy to bring them along; only two members (Zoro and Jinbe) joined after being specifically sought out by the captain; the last one (Brook) was such an obvious ringer upon introduction that the canon bent over backwards for the rest of his arc to telegraph that he’d be joining…sound familiar??
There is no pattern between specifical crew members. That's just your brain messing up wanting to see ghosts were there isn't (trust me, I know A LOT about that). There is only ONE pattern that applies to ALL Strawhats: THEY. DON'T. WANT. OR. CAN'T. BE. PART. OF. THE. CREW. FROM. THE. START.
Therefore, Yamato saying right from her introduction she is gonna be part of the crew is SUBVERSION DIALOGUE.