Yea, Murder Machine makes NO mention of DeMeo or Guglielmo conducting blood rituals. Not even Guglielmo...."The others call him Dracula, and not just because he had silver hair and a deep voice." So because of that line, you seem to believe Capeci & Mustain were adding credence to this "blood ritual/tasting" myth, that you mention Coffey speaking on in his book. It isn't because of the fact that Guglielmo's apartment was where majority of the murders actually took place inside the Gemini Lounge? Or not because Guglielmo himself is quoted as telling members of the DeMeo crew, that his floors were covered in a lot of history, when they'd be cleaning up the blood off the floors?

I put a lot more weight in MM than I would of anything Joe Coffey says, and again, Murder Machine doesn't mention DeMeo, Guglielmo or anyone else taking part in any "blood rituals".