As for Ruf. She has seen a lot of bright kids in her career and would be in a position to know what she is talking about.
I don't have any experience with her. She is probably excellent at identifying gifted kids when she evaluates them in person.
However, gifted kids vary a great deal. In our 4th grade class, there is a child (not DS) that scored 23 on AMC8. There were exactly 9 students nationwide in 5th grade (or lower) that received a higher grade. And this child is young for his grade, and so should probably be in 3rd grade. Yet, other than math, I don't think this child would meet many of Ruf's criteria for gifted.
