Unless Teach (or Shanks) finds the 4th Road Poneglyph before Luffy, then neither of them can find Raftel. So, unless somehow the whole world learns Luffy when finds it...there really shouldn't be an obstacles for them to coordinate where Raftel is, really.
Yes SHs could face no obstacle in their journey to get OP & PK title like Roger Pirates ( after they got Oden ), but that is anticlimatic, compared to if they fight BBP/RHP to get them.
But, let's say it becomes a walk in the park in SHs' journey to get OP & PK title, while BBP is going for either Poseidon in FI or Pluton in Wano.
Then that will be what forces Shanks to act like i said :
Yes they have the intel on Pluton & Poseidon, but this may be the thing that forces Shanks to stop him, cause if the BBP even gets 1 Ancient Weapon, the power gap becomes too big.
The BBP is already much stronger than RHP with Kuzan, it'll get much much worse with an Ancient Weapon.
Shanks has a bit of intel on the BBP : ( i assume that's how he stopped Kaido )
I assume the RHP will intercept the BBP & they will fight while SHs are on their journey to get OP & PK title.
And then the BBP will beat the RHP.
And then the news Shanks got beaten ( or even killed ) gets to Luffy, and there's no way he won't ever stop coming after BB's head considering how fanatical he is to Shanks.
If the BBP continues to go after Pluton in Wano, they might cause destruction to Wano and even beat Yamato Momo and the Scabbards, which will make Luffy even more angry.
Same if the BBP goes to FI to kidnap Shirahoshi.
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People who believe in Teach as FV should also believe in shiryu eos > mihawk and even though I like to shit on him I don't really see it.
Yeah i don't see it either, presumably his swords skills already peaked, and with them alone he was only slightly below Magellan ( YCs range ).
He also looked like a fodder next to Low Top Tier Old Garp & had to use a sneaky means to injure him so yeah i don't have any reason to assume his sword skills improved since Impel Down
So i think i can say that his sword skills are nowhere near being worthy to replace Nusjuro let alone Mihawk as Zoro's second to last opponent or his final opponent