To sum GA talked about why he thinks MM case was not an abduction.
Let me guess, he makes a big deal about there being no other fingerprints on the window while ignoring the fact the door was open anyway or that an intruder could have worn gloves. And he probably plays on the fact they found no forensic trace of CB, while ignoring that they also failed to find forensic traces of other people we know for a fact were in the apartment that night. I expect he also fails to mention that apart from one saliva sample, the only other forensic evidence they actually tested were hairs. (The blood behind the sofa was only found and tested much later on).
He overplays the forensic thing to the public all the time, making out as if they swabbed down every inch of 5A or something and tested for DNA traces everywhere when all they really did was collect a load of hairs. It's not as though you're definitely going to leave a hair every place you've been, especially if you aren't there for very long. Less so again if you're wearing a hat which is what a lot of burglars do. Fiona Payne was in 5A for hours right after MM disappeared before the Forensic sweep was carried out and they didn't find one single hair belonging to her.
The biggest problem with GA's theory is that it just makes no sense. He believes MM died as the result of an accident but the parents then fabricated an abduction to cover it all up. Why? If it was an accident, no matter how much you thought you might be blamed for negligence or whatever, faking a kidnap just isn't a rational thing to do. Staging that they died in some other way is one thing, but how many known cases in history have there been where a child has died accidentally and the parents have staged a fake kidnapping to hide it?
Not only that, he thinks the Tapas 7 were all in on this deception, some of whom the McCanns barely knew. And following on from this unplanned 'accident', he thinks the parents smuggled the body out of the OC and into some unknown freezer they somehow found, then caused a media frenzy over a fake abduction before going back to retrieve the body in their rented car weeks later to dispose of it. It's absurd, makes absolutely no sense in terms of plausibility or motive.