Recapping recent events: Retsu Unohana's past?

To recap the recent events


So, "Retsu" is Cpt. Unohana's nickname, her REAL name is Yachiru and she's the first and most powerful Kenpachi, Zaraki Kenpachi probably knows this so he named his Lieutenant "Yachiru" and himself "Kenpachi" because he admired the first Kenpachi (Unohana) so much.

So Unohana is more retardedly powerful than Zaraki is retardedly powerful, she's going to teach Zaraki all about being a Kenpachi, the art of killing, and quite possibly Bankai if it comes to that (despite the Central 42's objections, justified by the fact that if Zaraki leads a revolt they'd stand no chance)

Supposedly she retired to a life of healing because nobody could ever even land a scratch on her and she got tired of slaughtering enemies who couldn't even get near her.

>Zaraki Kenpachi is going to be trained by the most powerful Shinigami ever
>He named his Lieutenant after the first Kenpachi ("Retsu" Unohana, real name "Yachiru" Unohana)
>He will complete his Kendo training, and possibly learn Bankai
>May or may not fight beside the first Kenpachi (Unohana) when he completes his training
>Kyoraku has an eyepatch and a badass attitude now
>One of the Zero Division members admitted being accidentally wounded when Ichigo reflexively hit them back
>Implying Ichigo is way stronger than a Zero Division captain