Bit late to the party here, but basically, what slowman said. Charlie Francis himself ridicules the idea that elite athletes' techniques should be "fixed." Or, to put it differently, that they should be changed to conform with somebody's idea of "perfect" form. IIRC, one of Ben Johnson's feet turned out a little bit while he sprinted. If Gay or Bolt moves side to side or pumps their arms funny, it's because over the 10-15 years they've spent becoming the best in the world, that hitch or whatever helps them be awesome.
If you've got a beginner with goofy technique, then you can try to fix it, but in the end everyone is idiosyncratic and once someone is at an elite level, anything that looks weird or off is probably not a bad thing.
