Need I say more? This answers about every damn question you could ask. I know we have to spend years and cycles gathering the supporting data for what we believe but that single few minutes answered any questions for me!
This was a young white suburban kid running on hard surfaces and there are pebbles and stuff on the side walk and nothing bothered him. You could have put him in the rift valley with his barefeet and he would fit right in :). Of course, I'm sure it will only take a few more years in bad shoes and reducing him ability to run every day and he will be like the rest of us.