I've spoken with several QDEs, and they've never heard of such a scale. That "scale" was cooked up by two Ramsey-hired "experts," and even they couldn't eliminate her.
Handwriting analysis is, at moment, a negative process. By that I mean that it's more based on who can't be eliminated rather than who can be matched conclusively.
Thirdly, even if I bought this line, you have to figure in everything else. Even if there were others who couldn't be eliminated (and I'd like to hear some specific names), they were eliminated by other evidence.
To put it another way, once you eliminate the impossible, whatever remains, however improbable, must be the truth.
I say the same. Darnay Hoffman, whatever you think of him, said and has said that if the Ramseys wanted to shut him up, why don't they present this "analysis" in public? They never have, he says. And he is right. They've presented the polygraph, but nothing else really.
He said a lot more than that at the GJ. He said that it was only the bleeding ink and the disguised writing tht kept him from identifying her as the author. He also told his boss, Pete Mang, that he believed she wrote it, off-the-record. That's in PMPT if anyone cares.