Also, I don't think its really "copium" to suggest Yamato could join in the future. She said she wanted to live like Oden, which means she must also inevitably want to seek the one piece.
beyond that, she literally said in chapter 1051 that she's going to join the crew and in this chapter, Luffy basically gives Yamato an invite.
I think more than anything, the crew dynamic just doesn't make sense without her. Do any of you think Jinbei has top tier potential? That he could ever defeat an admiral? I just don't see that. He was matched up with Who's Who in wano, not jack. imo there's a reason for that, that reason being that he is ultimately not going to be Luffy's 3rd commander.
There is an issue, however, that if yamato joins now, she will simply be too strong. She would be stronger than sanji, possibly even zoro, and Oda isn't going to replace sanji as a wing. So I think, as with jinbe, that delaying her arrival makes sense. And with Caribou knowing about pluton, there is a lot of foreshadowing for an event that could potentially trigger her joining: Teach destroying the walls and invading wano.
I think Yamato joining in elbaf would make sense.
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This isn't to say Yamato is confirmed, but I think it would be a bit foolish for Worstgen to just dismiss the possibility of her joining in the future, after we've spent years entertaining the thought of ZKK; a theory which imo had significantly less backing than yamato joining the crew.