Ok, I see what you are talking about. Makes sense to me now.
I think I am skewed because I am talking to already admitted (obviously) kids and most of them have something unusual about them and often lower than 90% SSAT scores. BUT that unusual thing is quite interesting and is likely what got them in, neutralizing the need for super high scores. It also highlights, in my mind, the need to have something at which you excel and not just do some of everything.