Fresh eyes here...
I have not followed this case aside from knowing about it peripherally (at a high level) from snippets of news reports over the years. I haven't paid attention to the various developments, or the details.
I just read a description of the resort and where the McCann's villa/apartment was in proximity to the pool, public street, and tapas restaurant. I'm sure the decision to leave three toddlers alone in a room "and check on them frequently" haunts them endlessly. Their apartment, (if I understand correctly), was adjacent to the public street, and right by the pool. The path from the tapas restaurant and the McCann's room may have been 180 ft, but the path from point to point was circuitous. If only they had hired a nanny... : (
As with most child abductions, statistically, Madeline was deceased within 24 hours. The Perp (and I *do* believe the description of the man carrying her), could have been someone loosely attached to the resort....a delivery man, a window washer, it could be anyone. Clearly, he was stalking, and observing closely.
The only suggestion I have is the idea that a pedophile like the one that abducted Madeleine will strike again (most likely already has...more than once). Perhaps he didn't murder in subsequent attacks, but he has attacked.
This is where police must focus. They have a rapid dog on the loose.
I think Madeline's little soul passed over the night she was taken, and it will only be a fluke if any of her remains are recovered.
In my amateur opinion, all the rest is just noise and selling media ads.
As always, amateur opinion and speculation