in the two companies I have worked for the guys who struggle the most are the ones who have their ratings and then take a desk job doing whatever for 20 years and decide to "give the airline thing a shot" later in life when they're over 45. Those guys and the guys who do single pilot vfr type flying. It just ends up being to fast of a training environment for them. But to answer the question id still say the average washout raw is probably 10-15 percent. Whether it be can't handle it or just the guys who get all the way though ground school and then decide they don't like it. I've done it with AQP and non AQP type training. I'll agree AQP is a lot more lenient and don't have to know all the mind boggling numbers and limitations that don't apply to a pilot much. The days of engineering the airplane are over.