User blog comment:WhiteArmor/Ichigo-Teichou?/@comment-1743015-20100410014723

@Anomoly I was wondering the same thing once and this is what I came up with: Remember in the Turn Back The Penudulum arc when the captains were gathering for their meeting, Shinji and Love were talking about the captains that were present and absent. The 10th Division captain wasnt there because, according to Unohana, he gave his life in the line of duty. Maybe this captain was Isshin and he didnt actually die. And if you're wondering why no one recognizes Ichigo's last name, its more than likely that Isshin his name to Kurosaki upon beginning his new life in the real world. And he left Soul Society to be with Masaki (his wife and Ichigo's mom).