Board Thread:Fanon Canon/@comment-2089817-20180528043418/@comment-3403804-20180529092623

Well, most Aristoi are Kidou Specialists and many of them can't even use their Shikai, since they've dedicated their lives to the pursuit of magic, so the chances of one of them knowing Bankai is exceptionally slim. Megumi for example doesn't even bother carrying her Zanpakuto on her person anymore for that reason, besides, this little tidbit about them works in their favor by making them further distinct from the Gotei 13.

But yeah, as a whole the Aristoi tend toward lower-end Captain Class, with some being weaker or stronger than others all depending upon what their magical speciality is. Most are probably Ichinose-class, but some, like Megumi are more equivalent to a low-end Captain-level Shinigami such as your very own Hisagi, Kenji.