Chapter 266 English scanlation.
I don't think Sakamoto's fight can top Zura's (because it was pretty grand and Zura is the best, there is just no way around it), but it is shaping to become at the least not any worse, especially with Mutsu having already taken a hit. And I shouldn't be surprised at this point, but I still didn't expect Nobunobu of all people to get character development.
And in half a day, Shogun Assassination arc begins. This ought to be good. And long. The longest animated arc so far, Yoshiwara, had 8 episodes for 19 chapters (and dragged somewhat with that pacing). This arc has 23 chapters in the manga, so there is no way it will be done in December, so the anime will have to continue into the fourth cour. And then we have the yet unconfirmed but already hinted Farewell Shinsengumi arc which tops them all at 27 chapters, and that would push the anime into fifth cour with a few empty slots remaining. Just enough to cover the chapters which haven't been animated yet.
This may be an optimistic estimate but I am willing to go with it. It's not like the ridiculous complaints how it is impossible to insert comedy between the serious arcs carry any weight. It is the Gintama anime, they can interrupt an arc, even a fight midway just to switch to a Yorozuya background just to fuck with their audience, and have a naked Kondo apologize afterwards.
Everything will work out.