There is no reason I can think of why NTSB would not be looking for experts like pilots to help their investigations. Surprised I guess.
Although some years ago there were many pilots in many ports without the technical knowledge to articulate what they knew how to do by repetition and experience. I am pretty sure that is not the case anymore.
As an example, years ago, many times I tried to explain saturation speed to pilots as the ship is shaking and they are asking for more turns.