Actually... how would the BT female and BG female lines ever mix? Does a Reverend Mother have access to the memories of the mother-line of her father? Or would those female memories be blocked from her because access would be through her male-line memories? Have we ever come up with a definitive answer for that?
Because it is relevant: if the father's mother's memories are blocked, there's no way the BT & BG lines memories could be joined in one female other than through Sharing. And after the BG who went out into The Scattering had exhausted their spice and lost the ability to create new RMs, Sharing would have been lost to them along with OM anyway.
If the memory block was a result of BT genetic engineering, shouldn't it only have been remained effective in women directly descended from BT females? Wouldn't it have become less effective as new genetic material was brought into the mix? (The HMs didn't have children only with men descended from HM females after all, right?)
Hmm...
