Yes, the Yato leader has yet to come. I wonder what kind of fight he or she (would be fun!) will offer to us.
I read the chapter and... well, not my favourite for the moment, I did just like the part of the flashback trolling. I feel like the story goes slower, a little too much for me. I kinda feel bored... hope the next one will bring something new.
I agree, I feel that Jirochou's role is about to end too.
According to the last page of chapter 611, we still have 3 groups to take part in the battle. I feel like next one could be, if I guessed right, the Onmyoji (not sure at all about that one), then Asaemon, and then Shachi before the final fight against Utsuro.
(And now I wonder how many weeks that'll take for the manga to end. I don't feel like it's gonna end in "early 2017" as Sorachi said earlier, but more like in april or may. I hope he won't rush the end...)