I can see VS acquiring BMi, with VS becoming a part of star in the process along with a good deal for LH on interline flights and expand feeder traffic through the UK for VS and would allow LH to sell interline flights at a better rate for themselves through the BMi and VS network.
Remember RB's comments “There is likely to be an announcement of an alliance coming very soon,”
(
Virgin Atlantic Will Join an Alliance Soon, Says Richard Branson - Forbes)
It just looks like a way for LH to get BMi off the books but get something out of the sale in the long run...!