User blog comment:TVthePunisher/Six Unknown Shinigami/@comment-44061-20100804052943

Where does anyone get the notion that Isshin's time was before 100 years ago. Take note that no member of the Gotei 13 has ever physically been in his presence nor know of him indirectly. Thus any opportunity for recognition is void. Urahara knows him but how is questionable and Rukia has meant him but she may not know all the upper echelon Shinigami due to her age and low level in the Gotei 13.