I have asked him to explain in more detail how he concluded that it was physically impossible for the McCanns to be involved in Madeleine's disappearance, but he hasn't answered. (which is his prerogative). I just wondered if you understood how he reached that conclusion?
Theorem. Burglar A burgles 5A, and in so doing disturbs Madeleine, then silences her.
Makes it to a place nearby, where person B, linked to the burglary, is now confronted with a dead body.
Persons A and B are local, thus having much more knowledge of Luz than the McCanns.
Person A is Tannerman. Person B is Smithman.
Person B, with local knowledge, gets rid of the body.
Heri hasn't ruled out the McCanns. He is open to evidence that changes his current viewpoint. I mentioned your username as one of those more open-minded than most, and he was genuinely interested. Mind you, we covered so much stuff that I could write a book just about what we discussed.