"The older dancer"

Dance The origin of the pogo. Or HiLobrow identifies a social anthropologist at work, on screen, in A Hard Day's Night.

"The older dancer — who from 22:42-48 can be seen closely studying, and sometimes imitating, the other dancers, with lip-biting concentration — has never been identified; Beatles scholars have tended to assume that he was an extra who happened to be at Les Ambassadeurs that evening. HiLobrow’s research department has determined conclusively that the older dancer was actually the pioneering social anthropologist Clifford Geertz, then on staff at the University of Chicago! He was 37 when he was filmed by Lester."

Which is fine, except why did it have to be Ringo?