Im with you in hoping that Kiku finished off Kanjuro quickly and is not hurt, but do you think that he deserves such a quick death? He was a traitor after all and nearly cost them everything.
As for the weapons, we only know that Neptune is around. The Blueprints for Pluto were destroyed by Franky (although he might have memorized them) and we know nothing about Uranus. I do have a feeling that Wano might hold some information about Uranus, like its whereabouts or something similar.
I seems like all the signs are pointing to Yamato joining the crew, although I feel like it might be more like a tag along like Carrot, which I dont want. Speaking of new crew mates, what's Carrot gonna do after this? Is she gonna join as well? return back to Zou with cat and dog?
What part are we in the play now? We should be in part 4 if we go by the play structure:
1st act: slow opening and intro to characters and plot
2nd act: 1st battle (Kaido vs Luffy?)
3rd act: great tragedy (Oden flashback + Legendary Hour?)
4th act: Major battle (current)
5th act: swift and satisfying conclusion
Like you said before, I love how this arc has been handled. I cant wait to see how it wraps up. Hopefully there's gonna be a spread of Kaido being cut down by Luffy and Zoro and another of the Scabbards cutting all the heads off of Orochi at once. Anything less would not be satisfying to me.