User blog comment:Newgates/I find it weird./@comment-957629-20130502052704

Remember, Isshin didn't know Urahara, they are from completely different years as Captains!! Given Masaki's age, the current flashback must have been about 20-30 years ago!!

There is further proof; when Urahara was banished Byakuya was still a student and hadn't even met his wife, Hisana and yet he had met her before Hitsugaya had joined the Gotei 13 as he joined after Momo, who joined the same years as Rukia, who Byakuya subsequently adopted into the family!!

Thus the ages match up!! Urahara was banished a century ago, Isshin left around 20 years ago!!