Originally Posted by Saber
I just have one complain though.
Byakuya wouldn't shut up about a small Bankai like Ichigo's could not exist.
It's a plothole Kubo drove himself into, but he couldn't make Yamamoto's Bankai any deadlier if he didn't.
Not a plot hole (and not for the reason ck gave). Ichigo's Bankai is a compression of the Bankai's power to the form of a katana. Yamamoto's bankai doesn't change the shape of his sword, but expands the power of the flames.
Ichigo's sword isn't the only one that is small for bankai. Komomura's sword doesn't change when he uses bankai. Tosen's didn't change, Gin's didn't change, Toshiro's doesn't change.