I think that you are missing the point. I am not recommending that anybody emulate the Gulbis/Creamer approach. I only posted their swings as extreme examples of golfers who don't have a stationary head and who don't have anything resembling a pivot center in their swing, and yet they can consistently hit the ball well enough to play at a professional level. The question that it raises is what is the primary function of a i) stationary head; ii) a pivot center; and does the pivot center have to centralised between the feet throughout the swing.
You are free to express your opinions on this issue.