SoCal Pete, sorry but you don't really make good points. From the way you describe that study in The Science of Sport, it seems like 20 runners got thrown into dramatically changing up their form to a more natural gait, which their bodies obviously aren't used to, so they quickly got injured. duh, what else would you possibly expect.
the whole point is you have to transition very slowly to fix the muscle imbalances and atrophy that is caused by running in training shoes. I mean thats like citing a study that wanted to research if high mileage makes people faster by having 20 joggers start running 100 miles a week and 19 of them are injured within a couple weeks and therefore you prove that high mileage doesn't make people faster 95% of the time.
and i think you not only don't really have a firm grasp of the logic of science but also you don't really understand evolution (not an insult, just an observation from your post). of course there is no direct comparison in evolutionary history to prove that evolution favors barefoot runners over shod runners because in no part of human history have humans been born with shoes somehow biologically incorporated into their feet.
the point is that our feet (our bare feet) have formed through the evolutionary process, therefore the best and most efficient use of them is on their own because they were made to work on their own (excluding of course genetic defects or any sort of rare trait that would cause an abnormal physical attribute that would negatively affect the gait). and likewise yes you can obviously tell that we did not evolve to live in very cold climates because we are a hairless mammal. we evolved in the warmth of Africa, we couldn't go to colder climates until we started to put on clothing to keep warm in colder climates.
your example of a football team doesn't make any sense. because a football team is a group of people that has been very specifically selected by people to have certain traits. they are not representative of the general population. generalizing evolutionary traits only applies to the general population, not to any specific organism in particular, because there is variation in any population. take a group of midgets, do they show that humans today aren't the end result of an evolutionary chain that lead to 5 to 6 foot people? does a group of sumo wrestlers show that humans today aren't the end result of an evolutionary chain that has led to 100 to 200 pound people? NO.
there is no reason that going all barefoot is just plain stupid. there is no basis at all for that argument. of course the pads on our feet aren't as big and tough as other animals, so obviously we can't handle the type of terrain that most animals can. we might have lost that once we stopped persistence hunting and therefore no longer needed to be able to handle running over tough terrain for long periods of time. but we have still been made to run barefoot. sure maybe that means we need to stick to grass or clean surfaces (non-rocky trails, the track, roads without broken things on it, etc.), but the thing about that is that shoes only need to protect the foot from these things. so a minimal shoe is all that is needed when running on these tougher surfaces.
sorry that post is way long, i just really don't get how people don't understand evolution and logic. i look forward to anything else you have to argue with SoCal Pete.