True, but you are wrong about the source too - Cruyff learned from Michels the same way Michels learned from pioneers before him like Sebes and Jimmy Hogan.
Sebes was interchanging positions for players with Nandor Hidegkuti way back when when Hungary destroyed England at Wembley, inflicting their first ever defeat on home soil. In those days shirt numbers generally meant a position, as they were 1-11, but Nandor's shirt was different to what the nominal positions would be, and the English defenders were bewildered. Hidegkuti played as a second striker while wearing 9
Hungary kicked off, and scored within the first minute –
Nándor Hidegkuti powering a shot past Gil Merrick. It was immediately apparent that the rigid English WM formation was unable to cope with the more fluid Hungarian tactics; time and again Hidegkuti and
Ferenc Puskás drew English players out of position, allowing the more technically skilled Hungarian players to bypass their markers with ease. In particular, England
centre-half Harry Johnston had a torrid time, as he was unable to decide whether to man-mark the deep-lying Hidegkuti or to remain in position and allow him to roam the pitch freely.
So the point is that everything goes back.
Ultimately, almost every idea in football has its roots in the past, and can be traced (albeit crudely) back to the beginning of the game in the 19th century.