Ok... let me come up with my own crazy idea. What if ichigo's old man is from one of the 4 Noble families in soul society ( I think they said there was 4). Just think about it he did say "those of captain level or higher learn how to control there power....etc". Then he feel in love with a human while doing something in the regular world, and left soul society to be with them. It's just a thought to explain all this confusion we probably won't get for a long time or even at all.

What you guys think? The posibilities are endless lol .