Looking back in the thread, Sadie seems to support her theory of abduction by talking about the other missing children cases in Portugal. As if they are linked and there is a pattern.
They all seem to have obvious differences though. All of them missing persons or attempted abductions from outside and all but 1 were older children. Some of them are older boys, some girls. In the case of Renne Hasee it's possible he went into the sea.
In the case of Rui Pedro someone was charged in relation but not for the actual abduction. This man was a friend of the family, so was not a stranger. Rui Pedro was identified as being a victim in child abuse images, so that gives a motive - and is the only one that seems to have been confirmed as 'trafficked' out of Portugal. The only one. IMO the only thing that seems to link these cases is that they are missing children in Portugal.
I think the main difference here is that they all went missing in the day time in a public place, so what's the possible connection to the McCann case when it's a totally different M.O. ? At night, inside a house, a young child who can't be convinced to go anywhere?