Another problem with FDC is that there aren't a lot of kids of similar age that he could learn and copy from.
2 Out of the 5 kids were under the age of 2yo. The other were usually arounf the 4 or 5 years old. So some were too young and some were too old to interact with. He is now in a room with all kids that are between 2 and 3 years old. He has copied so much since going there. His speech has gotten much better, his social skills are blooming, etc. Ofcourse he copies the bad thing too, like saying certain swearwords, but you get that. I take the good with the bad