Gents,
When I was at the Mothership in August, I talked to Susan about this and many other things. What she told me was that John approached her at least once a year asking Alembic to make a copy of the Buzzard for him, but Susan always told him it was too ugly and wouldn't do it. Instead, she designed the DW, and the rest is history. Can't say that the Buzzard is better aesthetically, but the recordings I've heard are nothing short of amazing. However, in my view, the DW more than holds its own against the Buzzard from a tonal point of view.
My two cents,
Alan