Yeah, I dont think it was planned either, Mrs G. Well, no more planned than someone seeing William running around for an hour or two and watching him, and perhaps watching him playing during the prior afternoon/evening as well, then taking their opportunity and grabbing him.
I think the perp lives in or visits the immediate area, and this was an opportunistic grab.
I hate thinking that, because it is a horrible consequence for little William, but I just dont see anyone connected taking just one child. I think they would have taken both.
Thanks for bringing that up - I hadn't even thought of that. I had completely forgotten the fact that there were 2 small children running around.