Originally Posted by kael03
I'm going to assume "before" = "after" and this would be false. My own timeline is a little off. Rukia was sent to the human world ~40 years after she was adopted into the Kuchiki family/placed in the 13th division (she automatically graduated and was placed as soon as she was adopted). Kaien was killed somewhere in that time frame.
110 years before the Ryoka Invasion, Kaien was approached by Ukitake, who tried to persuade a reluctant Kaien to become his lieutenant. After Kaien declined, Ukitake mentioned Gin Ichimaru's graduation from the Academy and noted that he was the first genius since Kaien. Kaien denied being a genius and Ukitake told him that Gin graduated in a single year, which impressed Kaien. Ukitake compared his age to Byakuya Kuchiki, whom Kaien started to curse before saying that Gin sounded quite fearsome. He noted that he was even further from being a lieutenant and asked which Division Gin joined. Five years after graduating from the Shin'ō Academy, Kaien became the 13th Division's lieutenant.
Approximately 150 years ago
,Rukia and her older sister, Hisana, were brought together to Inuzuri, the 78th District of Rukongai, after they died in the Human World. Unable to live there while caring for a child, Hisana abandoned Rukia when she was still a baby. Rukia grew up on her own for a considerable amount of time. One day, Rukia tripped an adult who was chasing Renji Abarai's group of friends, and urged them to follow her to avoid losing the water they had stolen. Rukia joined their group, becoming their spiritual leader, and they lived together as a family. Ten years after
Rukia joined the group, with all of their friends dead, Rukia proposed they become Shinigami and live in Seireitei, noting she had heard it was pretty there. Renji agreed with her. Two months after entering the Academy,
she was approached by the Nobles and asked to be apart of their family.
Rukia accepted and was adopted into the family. Rukia was admitted to the 13th Division without taking their entrance exam. Same day she met her Lieutenant Kaien Shiba.
just to clear up the whole ruckus and confusion