User blog comment:Salubri/The Thousand-Year Blood War arc Plot Points/@comment-2226235-20131129021224/@comment-1387259-20131129021527

Apparently (but don't quote me on this) Kubo was rushed by his publishers during the time he revealed Unohana's Bankai. It wasn't so much laziness as it was assholes among the publishing staff. I would hope he plans to go more into it, so all we can really do is wait and see.