Here's what I think about the fullbringers' arc and the return of the shinigamis. This is actually long overdue.
After the Aizen battle I was kind of expecting a backstory on Isshin's life - how he came to live outside Soul Society. I think he is not a fugitive or a vanished captain like Urahara or Shinji. He could still wear his captain uniform, did you notice? I haven't seen Urahara nor Shinji do the same in any of their battles. Or I just didn't see it?
Anyways, instead of hearing Isshin's story, we got the story of Ichigo being a fullbringer. Honestly, I am not a fan of it. The story about Ichigo becoming a fullbringer is a waste coz I knew deep in my gut that it'll only take Rukia to transfer a part of her shinigami powers to Ichigo and he'd be back to his old fighting self. Isshin certainly had achieved the last form of his zanpakutou. I doubt he turned into a fullbringer himself to get back his shinigami powers when he personally knew the genius, Urahara.
Okay, okay, okay. Let's say that the fullbringers' arc is a way to introduce the ex-substitute shinigami in the story. But aren't there any other means to introduce him and make him want to kill his successor? Really! Coz making Ichigo a fullbringer and have him lose it that fast is just a waste of pages. It could've been used to write more about the re-entry of the shinigamis.
And... I believe I've already read about this plot. Ex- sub shinigami coming back from nowhere after mysteriously disappearing from years back just to kill off his successor and take revenge on the people he used to fight with. It's like Shinobu Sensui all over again.
Who's Sensui? He's the ex-spirit detective in Yuyu Hakusho who came back and wanted to kill Yusuke. Like Kugo Ginjou, Sensui also had allies like himself - mortal men with extraordinary powers.
So... that would be it. I am just now very anxious as to how things would work for Ichigo now that he's fully accepted by Soul Society. Also, I believe he is far more powerful now that it isn't just Rukia who gave a part of her reiatsu to awaken Ichigo's shinigami powers. All the captains of the gotei 13 and all others who became important to his journey gave a part of themselves to him. Plus, there's the mark of his fullbringer power. What would it add to his power? How would he look like when he transforms to bankai? And what about his vizard capabilities? Would he be able to use it still?
Wow! I just realized that there are so many layers to Ichigo's power now. Weee... ^,^
How about Rukia? Can she do bankai now? What's with the new headpiece of Byakuya? What happened to Rangiku now that her best friend is gone? Who is the new captain of squad 5? Who replaced Aizen? There's so many questions to answer, right? I can't wait to read the future chapters and get disappointed and amazed and enthralled and frustrated and satisfied. That's how a great story is being told, right? You just can't get all the good stuff at once. There will be terrible chapters and amazing ones. I am just hoping that the best is yet to come.