I have read the chapter like ten times and I just have to facepalm. So old man Zangetsu was never Ichigo's sword all along give me a break . This chapter shows you Kubo is the king of asspulls at least Kishi is decent and knows how his manga's story is going to end. But Kubo looks like he's inventing his story and doesn't have a clue how he will end it, it's like he's pulling things out of his ass I swear. I don't even known why I'm bothering reading this manga in the first place, I apologize to all the fans but maybe I should take a long break from Bleach.
It's always been clear that Ichigo's zanpakutou wasn't normal. Hollow Ichigo seems to be capable of fusing and overwhelming Zangetsu at times, and we don't have a lot of info how it worked with the Visoreds. Basically introducing a reason for his unique powers helped explain some of the issues with him having multiple spirits in the first place. It also helps brings things full circle. It helps us realize Ychwach is a deeper villain than this single arc.
Honestly, like Greed said, if you're a Nardo fan I really don't see how this bothers you so much. I even tried to pick up that manga again a while back, but ended up just getting mad as Kishi butchered several in-universe laws to insert his random Hokage reunion.
And, erm, I really don't understand why you need to announce that you're leaving the fandom exactly. XD If you're not interested, no one's gonna force you keep reading. I really can't be bothered to read Naruto anymore, and you don't see me pushing that on everyone here.