I'm afraid it does Adam. That's why you need to dig a little deeper than a book written 23 years ago.
What's Wilkes's book got to do with this ?
Great. I've always wanted to see a document that the police had stored Sheila's blood.
I assume Steve was right and you are referring to soaked blood in a bucket. Therefore the claim the relatives had access to Sheila's blood has been dismissed.
The relatives must have asked Stan Jones for Sheila's blood.
The other option is Stan Jones fabricated a silencer himself and asked the relatives to create false WS's and say they found the silencer.
Either way the relatives & Stan Jones had to work together. Which makes the frame even more unlikely.