honestly the only reason i see any character (New or Old) joining is either for a significant story purpose, which is why i think Vivi will come back and why i kinda still think Momo will join
or
As serious power boost for the crew like with Jinbe and why i like Yamato as a candidate
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I dont think the role Yamato take on the ship is important as we've filled the required NESSESSARY roles like Navigator, Doctor, Cook and Shipwright
If she does join I think its to provide a significant power boost to the crew, much like how outside very rare occasions a helmsman as skilled as Jinbe isnt needed, but his strength is significant