This chapter really caught my interest.

There are so many paths Oda could take right now.

1. Cainie Kidnapper selling her to a Tenryuubito and her rescue results in the Tenryu being hurt which would bring in the Navy.

2. The Strawhat meet a Tenryuubito who will become a crew member or at least one that is not a complete bastard who will help them in someway since it's very possible that not all of them act like those we've seen.

3. The Pirates Rookie battle royal that a few have speculated.

4. The Navy is being held up, but by what? If whatever keeping them busy is not Dragon then this would be a great chance for his forces to do something. I would think that for a Rebel army, attacking and subsequently harming a majority of the peoples that the World Government is hellbent on protecting would be considered a great victory. If the rest of the Tenryu is like those we've seen so far then they are probably not very well liked by regular peoples, Dragon could rally a lot of support by attacking them.

5. We already got a hint at the end of Black vs Ace duel that it was the "trigger" for the great event yet to come. Shank and White Beard met for a reason, if I've learn anything from one piece it's that Oda rarely ever does anything without linking it to something else down the line. It is very possible for White Beard and Shank to team up and try to save Ace since Shank has ties with Luffy and White Beard would probably want to save his First Mate. That could be the thing that is keeping the Navy so busy that they won't worry about anything else unless it's a huge crisis.

Those are just some of my speculation, but Oda has created a perfect setup to where it's possible for anything to happen.

I personally would love to see either 4 or 5 happen and maybe even both together. I personally feel that while the stuff like Moria was really cool, having the Straw Hats beat one Shichibukai after another would get really stale. This is probably a great time for some shit to hit the fan and for things to get chaotic since they are close to going to the new world.