Next arc is Hachinosu?

[Warmmedown]

Luffy hears about Garp and goes there. He teams up with Koby. He kills Blackbeard.

Or if it's too early for BB's defeat, Luffy sends Zoro and Jinbei with Koby to fight Blackbeard. They may be strong enough to rescue Garp, but not to defeat Blackbeard.

 

[Future Warrior]

Very unlikely. I think he’s gonna make a deal with the WG in exchange for Garp

 

[Warmmedown]

What could he want?

 

[Future Warrior]

 

[Warmmedown]

In that case I don't think Garp is enough leverage. The celestials probably don't care about Garp that much.

 

[Future Warrior]

That's the endgoal. BB seemingly has a multi step process to achieving it.

For one, he wants to establish Hachinosu as a WG-affiliated island. Garp is an icon of the marines and among the strongest in the world, they most certainly do care a lot about him. Enough to create a deal.