Fran, you'll note I was careful not to phrase it as "gospel" in the book!
I know too well the risks of stating something absolute in the absence of definitive proof (and sometimes, even when you DO have the proof, you still get called out on it). All of the evidence I list in the book for this conclusion is what legal experts would call "circumstantial", but I do feel that taken together, it forms a good basis for a "reasonable conclusion".
And I will be the first one to offer congratulations to anyone who can offer concrete proof one way or the other, helping us definitively resolve the Spanish 109 situation.
Cheers,
Lynn