I think that although Ali did rely and excel because of his natural gifts ,speed ,reflexs ,athleticism etc ...he also had an almost flawless technique to fall back on ...a technique that can only come from a long long apprenticeship in the ring ,an automatic ,unthinking call back when the going gets tough , when natural gifts aren't enough .you saw this more and more as he got older and less mobile ,lost speed ...other heavyweights who are relying on their natural assets don't have this to fall back on ,so although fury won't get any shorter or less awkward ,his mobility will wane and with it