Yhwach is cut in half. Yhwach melts. Well, that's clearly ended the fight right there.
No wait, Yhwach is a villain. So his powers work from beyond the grave.
Seems like Aizen's illusions are the same for everyone affected; He can't make one person see him stabbing Momo and another person see Toshiro stabbing Momo. And yes, Kyouka Suigetsu beats The Almighty.
And Yhwach is back, obviously. Something happens to Aizen, but it's really unclear. Aizen is no longer using Kyouka Suigetsu, i guess he sealed it once Yhwach was dead. Being a villain, his powers let him un-kill himself. I bet that if Ichigo had the same abilities, this wouldn't work.
Alright, Tensa Zangetsu isn't broken. I say this, because the sword actually breaking is the default. And i'm sorry for lying to you. Why doesn't it break fully this time? Last time it survived because it was an Illusion, but there's no reason it shouldn't have broken this time.
Okay, Ichigo get's raped by shadows. Par for the course at this point. Yhwach is the size of the Seireitei, being "Contained" by the useless shield. Everything is exploding.
Oh look, it's #NotDeusExMachina because we were introduced to that arrow like two chapters ago. Apparantly Uryu is such a good shot that he can hit someone in the back while standing right in front of them.
Okay, the Arrow is made of something called Still Silver, and it stops Yhwach's powers for a short time. Well, if Horror movies have taught me anything, it's perfectly safe to lower your guard. Even for an instant.
Tensa Zangetsu is not broken. Sorry for lying again, it's a habit. But what's this? It turns out his Bankai was actually a Shikai all along! Well, that makes no sense. Seems the dream he had a while back was actually Haschwalth giving him a glimpse of the future. Stupid ass metaphorical future sight, why didn't it show him being shot with the arrow?.
Yhwach is cut in half. In other words, nothing happened in this chapter. This is probably the death blow, with the series ending in so soon.
Okay, regarding Tensa Zangetsu turning into his old Shikai; I stand by my preposterous claim that it was a Bluff and his real Bankai was the dual wielding all along. It's not exactly the same, since it's missing the cloth.
Not sure what happened with Aizen, but I doubt Kubo just killed him off. Aside from anything else, the world needs a new Soul King, and Aizen is basically the only candidate.
Next Chapter; Yhwach reveals that he saw the future where he was killed again, and then changed that as well, since his powers still exist in the past. Uryu is out of Silver Arrows, so Yhwach wins. The end. I say that as a joke, but it could easily happen.