The backstory of Hakubi Washu is my favorite, and i'm sure many other peoples 
favorite 'mystery' of the Tenchi Universe.

>Habuki and her sister Masaki would not have been very
>remarkable, were it not for their mother. 

Masaki?
....
anyway..
I won't argue the possibility that Washu's human body is borrowed.
BUT
as far as a proper mother/sisters.. I see no evidence to back this.. 
on the other hand there's plenty of evidence to show that she has no living 
(mortal) parents or siblings... or in the least none that are remembered 
since she was found as a baby.
I also see nothing there about her status among the goddesses.. I'm assuming 
that'll be in your next installment.. but seeing that the gems were on her 
when she was found.. seems like something should be here instead.. but I may 
be jumping the gun huh?

>For civility's
>sake I'll call this a fanfic outline, and operate
>under the blanket of theory instead of fact.

This line is saving me from tearing you a new one... that and the fact that 
it's only a TV show   :P
As I said in a previous mail.. I enjoy the mythology... send more of THAT!  : 
)
speaking of the Yi story.. I found more applicability of that myth to shin 
than the OVA.

-Ken-Ohki attacks with Cat-Fu!!