Who ever is responsible for the disappearance of William was surely aware of the foster situation and more than likely the protections offered by laws regarding media blackout. Which as we all know too well ended up with the initial scenario of foster parents and fgm being put out to the public as bio parents with the Tyrrell surname.
What I found really peculiar about Spedding's youtube video was he referred to the address William was taken from as 'the Tyrrells'. why didn't he just refer to the address as 'benaroon drive' address? He never mentioned street name! Also strange is he uploaded the video on the anniversary of his 1st visit to Benaroon so he would have known fgm name due to that appointment. He either knew the laws that prohibited identity of ff being divulged or had a legal prepare his blurb. Afterall the Speddings were involved with the FACS fostering system weren't they as they had cared for children through the FACS system.
Those responsible planned the process to minutae and would have known all facets that supported their quest.
It seems to me William was chosen due to this and more than likely his sibling was also a target - that could also be a major reason for total blackout re foster parents' physical identities being protected. Easy for them to do change of name not easy to change physical identity of themselves or the remaining child.
And as always I state that I am not indicating any direct involvement of either bio or foster parents.
This all sounds well & good, except it could have been an opportunist abduction. Someone heading into the forest for example...