User blog comment:BU1898/Bleach: So Many Questions/@comment-44061-20100531135756

In factual terms there is a big hole here mainly in regards to Isshin. Isshin had no Shinigami powers as of 20 years ago. Rukia who is about 150 years old has been around Isshin multiple times and never once recognized him as a captain or anyone else. 54 years ago she was found by Byakuya in the Shinou Academy and about 47-45 years ago she formally joined the Gotei 13. In either case she would have known who he was but apparently she doesn't. So even if Hitsugaya had been captain for only 20 years which isn't confirmed it still doesn't account for Isshin Kurosaki. Also Aizen doesn't appear to have previous knowledge of him, which would mean he wasn't around in Aizen's time which spans at least 100 years.

There is also no basis to claim that Ichigo's family looks anything like the Shiba's to date the only one looking anything like them is Ichigo looking like Kaien and to point at a fact both Kukaku and Ganju have never mentioned a remote resembles to their brother whether others have. Also in the manga it is stated upon Isshin arrival that Ichigo is the son of a Shinigami and a human. If Masaki was a Qunicy (crack theory not even remotely allowed on the site) she would have been able to protect herself from Grand Fisher and if not herself her child. Wheres the proof she was one or she lost her powers if she was one. There is no law against falling in love in SS or even with a Quincy that we know of. For all purposes SS believes Qunicy to be extinct or at least endangered and didn't seem to concerned about the few (the Ishida's) left.

The bed thing is flimsy and irrelevant at best. Ruyken can know Isshin for various reasons. Their both doctors they are both spiritually aware they may have had a run in long ago and become friends of a sort. As far as how Urahara and Yoruichi know Isshin they are all Shinigami of former high rank. Also Urahara has the only shop catering to Shinigami in town or the human world that we know of. Also Yoruichi has shown no real association with the other noble houses besides being a friend of Kukaku and annoyance to Byakuya. They are all or where high ranking nobles of course she knows them.

The whole thing about the shiba house is unfounded and not even backed by anything to be remotely speculation.