I have some sympathy with Sadie's theory but it ultimately relies on the Tanner sighting being that of an abductor. However, as both SY and the PJ have recently gone on record to say that Tannerman was an innocent tourist and so irrelevant, I can see no basis for it being true.
I must add that I don't believe that the man identified by SY was the man Tanner saw.
I don't think that is exactly what Scotland Yard said and as far as the Judicial police are concerned they are very enigmatic at the best of times.
However they are looking for an abductor by all accounts and they are looking hard enough to have allocated more personnel to the endeavour ... so they are very serious about about whatever it is they are doing.
Snip(Unknown Man's VO) - It was the second case in the Algarve where the answers were missing, in Maddie's case no one gave up. The process ended up being archived, and then re-opened, it was public and now is once again sealed. It was then sent to Porto, to be analysed by another team, that it was now reinforced with more resources. The PJ admits that they may be able to shed light on the mystery, they believe they can prove what happened to Maddie. ~
Translation by Morais