I think he used a combination of Chuck Berry plus a host of other black singers when settling on his stage movements.
I couldn't agree less with you on that one. To me it seems more like what white middle-class people used to do when they heard said black R'n'B-groups and Rock'n'Roll
I never said he was good at it

But over the years I saw a bit of Chuck, James, Camp Little Richard and from the early 80s, a little bit of the Temps.