There's a common theme in this arc, of characters questioning or not believing Luffy and the Straw Hats as actual power houses and worthy of being called a Yonkou crew.
And i think Oda is gonna end this arc by making sure that everyone in the One Piece world knows that Luffy and the Straw Hats aren't fucking around.
In many ways, it's like the Marines are doing what the Straw Hats did in Sabaody.
Pulling up on their place and being all confident they can take them, then getting blown up in their face.