The evidence is there the hips shift forward on the downswing and they rotate. There is no doubt of this and to say that there is no shift is really baffling. If there was only rotation then the spine as referenced by Todd would not be even with its address point it would be behind the address point. The hips slide forward during the downswing.
Also, as Peter pointed out the lower spine is more in the center of the body so it is forward of where it was at address.
Peter has agreed that the beach ball effect does happen and he has been extremely accommodating and civil in this discussion. Your comments are unwarranted and rude. LOL I know this to be true because I have done the same in the past!