"About Swab 3a, John Lowe on the final report is very clear: it’s EITHER from Maddie OR from one of her parents."John Lowe says nothing of the kind.
That only has ONE interpretation, it MUST come from the McCann family.Nope. If that was true, Lowe would have stated that it ''must'' come from the McCann family. He doesn't.
There’s nothing, absolutely nothing inconclusive about that unless one wants to talk rubbish.
But do note that John Lowe does not say “In my opinion, there are no indications that justify the theory that any member of the McCann family had contributed DNA to this result” for Swab 3a. He only says that for Swab 3b.
For Swab 3a he only says he can’t determine from which body fluid it comes from, nor how and when it got there.
About this swab, on the interim report Lowe states categorically that “all of the confirmed DNA components within this result match the corresponding components in the DNA profile of Madeline McCann”