Can't speak for anyone else but throughout a round my drives are all over the place, short, long, left and right. But I don't see many guys hitting it over 220 regularly that are playing to a 15ish. For every drive that goes beyond 250 they hit a bunch of crap. We have a 317-333 yd par 4 at my former home course, most men play whites so call it 317. In 2 seasons playing at least 100 rounds there I rarely saw men hit it up to the 100 yd marker with a driver. It's not that they can't hit it further but that they lack consistency. They might hit one great drive a side, a couple of ho-hum drives and the rest are flat out bad. That's what I see from the 3 to the green 2 putt types.
I was thinking about my responses over while reading your thread and what DSC123 mentioned, and the "15" handicappers I know.
At least one of the people I know is on this forum, and I know he averages farther than 250 carry with a 15-ish handicap. This might skew the data for me. He is probably taking 5SK or at least using the information on this site, and probably has a better swing than most 15 handicappers. I have not played with the ones on this forum that fit your chart, but was told by them that they are a short hitter after an outing. So, we are at 50/50 with the ones I know from this site.
I was given a 17.3 handicap, which turns out to be surprisingly accurate, and have been taking 5SK style lessons. So, maybe my swings are better than your typical 15 handicap, I will add some more current swings to MySwing thread for you to evaluate. I think I have finally combined keys 1 to 3, to be judged on the 8th of March.
However, my experience is really limited. I don't know how a "typical "15 handicap swings the club, I only know that I get past the red stakes (and the other "15" handicappers I know hit just as far) a lot of the times on short par 4. Even the longer 440 yard ones are usually driver-iron.
I will admit that my responses might be skewed, because of the training I am getting.