I don't think you understand the level of athleticism involved in Olympic track and field.
Since I assume you don't actually know why Ashley Eaton is, let me list his PRs for you, with closest comparable NFL athletes at each event that I could find.
100m: 10.21 seconds (Jamaal Charles ran a 10.23)
400m: 45.00 seconds (Antonio Cromartie ran a 46.90)
110m hurdles: 13.35 seconds (Rod Woodson ran a 13.29)
Shotput: 50'6" (Lane Johnson threw 49'7")
Discus: 155'4" (Russell Okung threw 155'9")
Long Jump: 27'0" (Marquise Goodwin jumped 27'4")
High jump: 6'11" (Julio Jones jumped 6'8.5")
So, basically, try to picture a 6'1" 185" guy who is comparable in speed to some of the top DBs, in strength to some of the top OLs, and in jumping ability to some of the top WRs.
Still convinced that the best athletes gravitate to the NFL?