User blog comment:DashingSword/Chapter 397/@comment-1384274-20100325203829

i think you've forgetten, isshin was a captain of the gotei 13 and lost his powers 20 years prior to the bleach storyline (possibly the 10th division because hitsugaya is a relatively new captain.) aizen we all know has been apart of the gotei 13 for over 110 years prior to the storyline.