Tons of Mexicans play HS football here in central Cali, so where are the NFL caliber RB's? Who is the stud Mexican NFL RB...well? How many millions of Asian Americans, where is that Asian NFL RB, well?
The thing is this. We only find that size/speed/quicks in those with roots to western Africa. We have never seen a big, quick, fast, white RB either. White RB's are power guys or a small cat like Danny Woodhead. There are no white, Mexican, Asian Bo Jacksons, Herschel Walkers, Marcus Duprees, Curtis ey (215 pounds and a world ranked sprinter).
When John Riggins was in HS he was a Kansas State 100 yard champ with a 9.8. But, he wasn't the 240 pounder thumper then we saw in the NFL. Jim Taylor and Larry Csonka were just bulls.
Hugh "King" McElhenny had speed and elusiveness, but he like Taylor played back when we still had white cornerbacks.