Ds 6, is very verbal. He often has quite muddled ideas and rambles a bit when he speaks, but at other times he can be very logical.
Anyhow i have noticed that if myself or others are telling a story of something that happened to us, immediately after ds will retell more or less the same story, not word for word but the same story as if it were him involved with maybe a few different bits in it. Is this echolalia?