I'm also saying that her fighting Jack no bearing on that happening before or after she encounters her father.
It does actually, Oda has been saving her DF reveal for her Kaido fight and has interrupted all her fights with Kaido's executives (Luffy interrupted her fight with Ulti and Franky interrupted her fight with Sasaki).
Yamato isn't going to get a full fight with Jack before fighting Kaido. And it's doubtful she'll be in fighting shape after she's done with Kaido.
Nothing indicates she will fight Kaido until he's defeated.
I said that she wouldn't be the one to finally defeat Kaido.
Law was warranted to fight Doflamingo until he lost, twice in fact. Luffy then took over.
And Law didn't fight anyone after he was defeated by Doflamingo, because he was in no condition to.
Yamato's first full fight would be vs Kaido. We'll get her to reveal her Zoan form and then her Hybrid form.
Given their similar fighting styles in Base, we may get three facets to their battle:
- Vs Base Kaido
- Vs Dragon Kaido
- Vs Hybrid Kaido
There may also be a flashback scene.
Yamato will probably not be in fighting condition after she's been defeated by Kaido.
Jack may have already been defeated by then.