While not impossible people could've worked theirs out during the 18 months, Kubo kinda wrote himself into a corner implying shinigami typically need a hundred years of training and then some before they can unlock it. And as Renji displayed against Byakuya, just knowing it doesn't convey mastery. As is, we know the usual requirement of a captain is have a bankai. If we see Kira and Shuhei wind up being promoted from their spots, it's possible they might've. I'd consider Shuhei a stronger candidate for this since he'd been more hyped over time and his "fear" of his sword might convey a greater understanding of its spirit, filler arc aside. And while Momo is also in a captainless squad, I just don't see her being capable yet, as oddly popular as she seems to be.
Anyway, there's still a shit ton of potential kido to see, and it's something Ichigo's shown no aptitude in. It might be interesting if he starts working on that aspect of himself with the power reboot, but it's most likely we'll see new stuff from others. Would be nice to see Rukia not spam Sokatsui like a bad Ryu player does Hadoken, too. Otherwise, still some bankais of expected people to see, like Urahara. We also know jack about Yoruichi's sword, Nemu's (Mayuri's VC), Yachiru (silly Kenpachi theory aside), and to a lesser extent Isane's (she used it, but got curb-stomped by Ichigo before we could learn anything about it). I still want to see a good Unohana fight, too, as that was something Kubo promised a long time ago.
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