“At the risk of sounding ignorant (given so many deleted posts) or heartless or both: does Declan exist?”
Yes he does, or at least did and still does as far as I know.
“How come no one asked a BRaT Rep. to weigh in?”
They were alerted and well aware of the situation, plus a rep did weigh in earlier in the thread.
“Has BRaT at least confirmed this fostering placement?”
They give little information, however they were aware of the situation and the persons defamation.
“Given the many "unfortunate" verbal volleys, how could BRat have allowed Declan, if he exists, to remain in this particular foster care for so long?”
You can have the best intentions, people will still abuse them. No doubt they will learn from the situation for future and amend their protocols. Sometimes you have to believe people even when they lie to you, until you know for sure they are a liar.