I remember we debated whether or not he should run in the olympics a while back. Same argument everyone has about him having an advantage with the springs. No conclusive evidence in either direction though, but I say it shouldn't be a problem. At least not now. In my mind it's leveled out, because even though the springs don't lose nearly as much energy as an achilles tendon, he's missing the entire active component that other runners have to give them more spring. He has to compensate through the rest of his legs and especially his core to keep his legs high, that and his arm swing has to be harder and tighter than others just to keep him balanced. Until there's conclusive evidence in either direction I'll continue to be inspired by the man. Just the fact that he puts a smile on kids with a similar condition and gives them a little hope makes me like him.