Runfastrunfar
Thank you for the well researched reply. I agree with pretty much everything you say except for your overall conclusion regarding impact of recruiting NFL/NBA talent to Olympic sprints and jumps.
At USATF champs, the three best jumps were all over 27 feet and the reigning champion didn't make a legit jump. For the long jump field to significantly improve, there would have to be 2 or 3 28 foot plus guys and one 29 foot guy lurking out there.
As far as I know, the US has never had more than two guys over 28 feet at one time and Powell and Lewis just happened to be the most talented and dedicated jumpers in the history of the world.
So asking why the US long jump has gone backwards is similar to asking why the UK can't put out 3 sub 3:50 milers like they did in the 1980s. Ovett, coe, and cram were simply exceptionally talented and driven athletes. Soccer was just as popular and rewarding as it is today and converting all the developmental teams in the UK to track clubs won't reproduce those three guys. Could the UK produce more 3:53 guys, sure, but that's not the question.
Same logic applies to the 100 meter dash. I would guess that there are somewhere between 10-20 legit 10.0 to 10.2 FAT guys in the NFL right now given a year of training.
However, from 2008 through 2016, it has generally taken somewhere between 9.69 and 9.85 to be the best sprinter in America and sub 9.95 to make a WC or Olympic squad. You might disagree, but I doubt the NFL has ANY sub 9.80 guys hiding out. See my Chris Johnson Walter Dix high school comparison from earlier post.
Again, I appreciate all your insight and knowledge but think the pointy end of the stick is about as sharp as it can get without unlimited pharmaceuticals.