re: I’m not defending JD but he seems to be a kid who gets rattled easy. He gets nervous.

This was JD's m.o. last season as well. His eyes drop and he waits too long and doesn't hit the WR's in the break.
His decision making is too slow. That tells me his pre-snap read is not what it should be and he sits and waits for somebody to be open and is to worried about hitting them when they make the break.