Wow!! Another awesome Chapter by ODA .... He didn't make it necessary for Luffy to become HERO of the Fishman Island by destroying Noah. He made sure that the fishman acknowledge the power of Luffy and respect for human-kind. Not like many other manga's where the Hero saves the day. Hats-off to Oda.
The double pages were simply mind blowing. Even from the last chapter, when I though the story was too small, Oda gave a real visual feast here.
As for the story goes, I am happy to see that the Arc is almost at its end and to see how the powers of shirahoshi work.
I agree with LOVE COOK that revealing hints about void history makes sense. I hope your prediction comes true. As for my prediction, I still think that shirahoshi has good chances of becoming a nakama, but will not debate on it any further. Next chapter, we might see the Fishman island in celebrations!!!