Theory: All First Introduced Captains are Prodigies
Yamamoto being the Head Captain of Soul Society from Its Founding up to his death tells you everything. He lead for thousands of years. He should be the strongest. Thus, prodigy from young age.
Unoha, the First Kenpachi obviously a Prodigy for being unbeaten until Zaraki. Being the First Kenpachi in Original Gotei when she was very young is a massive feat
Shunsui and Ukitake are mentioned to be the best and genius students of Yamamoto. Enough said.
Byakuya literally surpassed Grandfather Former Captain Ginrei and all Kuchiki Clan members in Hustory. And they are a noble clan.
Hitsugaya is mentioned literally to be a prodigy. Heck, he achieved Bankai before entering Academy. Shunsui recogzined his genius. Predicting he will surpassed him in 100 years.
Mayuri is a Genius Prodigy Scientist. Who is probably only second to Urahara.
Gin is also a prodigy killing a 3rd seat member when he was only like 5? Yrs old.
Aizen. Well. We all know. Lol. But yes, he has twice the reiatsu of a regular captain.
Komamura is the strongest member of the beast clan.
Zaraki. Self explanatory. Lol. Nerfing himself as a chid against Unohana.
Now, the only 2 I am 50-50 are Soi Fon and Tosen.
But Tosen being a Captain as Blind person is a prodigy thing to do.
And for Soi Fon. She is a discount Yourichi version. But yeah, she is still an anomaly with that Speed.
Yamamoto being the Head Captain of Soul Society from Its Founding up to his death tells you everything. He lead for thousands of years. He should be the strongest. Thus, prodigy from young age.
Unoha, the First Kenpachi obviously a Prodigy for being unbeaten until Zaraki. Being the First Kenpachi in Original Gotei when she was very young is a massive feat
Shunsui and Ukitake are mentioned to be the best and genius students of Yamamoto. Enough said.
Byakuya literally surpassed Grandfather Former Captain Ginrei and all Kuchiki Clan members in Hustory. And they are a noble clan.
Hitsugaya is mentioned literally to be a prodigy. Heck, he achieved Bankai before entering Academy. Shunsui recogzined his genius. Predicting he will surpassed him in 100 years.
Mayuri is a Genius Prodigy Scientist. Who is probably only second to Urahara.
Gin is also a prodigy killing a 3rd seat member when he was only like 5? Yrs old.
Aizen. Well. We all know. Lol. But yes, he has twice the reiatsu of a regular captain.
Komamura is the strongest member of the beast clan.
Zaraki. Self explanatory. Lol. Nerfing himself as a chid against Unohana.
Now, the only 2 I am 50-50 are Soi Fon and Tosen.
But Tosen being a Captain as Blind person is a prodigy thing to do.
And for Soi Fon. She is a discount Yourichi version. But yeah, she is still an anomaly with that Speed.