Three things, then I'm out for now:
1) Yamato joining is fine on paper. Yamato still keeping her absolutely nerve-killing and cringeworthy Oden cosplay is annoying beyond belief though. If Oda really lets her keep that, I hate her joining the SHs.
2) What's up with Oda's weird obsession for characters nobody else gives a single fuck about? Tama & Co. are just a waste of panels as hard as that sounds. Doesn't have to do anything with the fact that they aren't fighters, they are just written in a completely boring and redundant way.
3) It may sound like a broken record, but this still doesn't feel like the end of an arc at all (let alone such an important one). It really feels more like there is a massive bomb going to drop in the next few chapters. Well, maybe I just expect too much from Oda ...