I'm not going to respond to all of your remarks, only a couple.
IMO LT was placed into temporary care prior to William being removed, once William was removed her care status probably became permanent as well. If that was the case FACS would most definitely try to place the children together, which is why they were placed with this FF.
I have heard (consider it a rumor) that this was not their first experience at fostering, if that is true then they had obviously had children in temporary care beforehand.
As for stories of nok being passed over, sometimes the nok are not eligible, they might think they are but they are not. People complain all over the net, you just can't believe everything unless you know them.