Forum:Gotei 13 Rosters

We know of two generations for the Gotei 13, both of which I'll elaborate below:

Turn Back The Pendulum: Genryūsai Yamamoto with Chōjirō Sasakibe Yoruichi Shihōin (exiled) with Marenoshin Ōmaeda (retired) Rōjūrō Ōtoribashi (exiled) with Chikane Iba (presumably retired, status unconfirmed) Retsu Unohana with Seinosuke Yamada (presumably retired or deceased, status unconfirmed) Shinji Hirako (exiled) with Sōsuke Aizen (promoted) Ginrei Kuchiki with Sōjun Kuchiki (deceased) Love Aikawa (exiled) with Jin'emon Kotsubaki (presumably retired, status unconfirmed) Shunsui Kyōraku with Lisa Yadōmaru (exiled) Kensei Muguruma (exiled) and Mashiro Kuna (exiled) Both captain with lieutenant of the 10th are unknown. Gosuke Kiganjō with no lieutenant chosen. Kirio Hikifune (promoted to Royal Guard), Kisuke Urahara (exiled) with Hiyori Sarugaki (was Hikifune's lieutenant beforehand, exiled) Jūshirō Ukitake with Kaien Shiba (promoted around the time Urahara became captain)

Current Storyline: Genryūsai Yamamoto (status unconfirmed, likely deceased or incapacitated) with Chōjirō Sasakibe Soifon/Shaolin Fon with Marechiyo Ōmaeda Gin Ichimaru (defected/deceased) with Izuru Kira Retsu Unohana with Isane Kotetsu Sōsuke Aizen (defected) with Momo Hinamori (status unconfirmed, likely deceased or incapacitated) Byakuya Kuchiki with Renji Abarai Sajin Komamura with Tetsuzaemon Iba Shunsui Kyōraku with Nanao Ise Kaname Tōsen (defected/deceased) with Shūhei Hisagi Tōshirō Hitsugaya with Rangiku Matsumoto Kenpachi Zaraki with Yachiru Kusajishi Mayuri Kurotsuchi with Nemu kurotsuchi Jūshirō Ukitake (status unconfirmed, likely deceased or incapacitated) with Kaien Shiba (deceased)

Now, this is my question: Ginjirō Shirogane was Byakuya's lieutenant, who retired later, while Ichimaru was Aizen's lieutenant before being promoted, so by that logic, there's been at least three generations of the Gotei 13, but what I'm asking is, do you think we'll be able to see that 'missing' generation, so to speak?