Phil. I'II wager that you don't drop your elbow in an Oversway. Not much difference between the two. One the feet are apart, the other they are not.Sometimes I wonder where the steps came from. On Richard Gleave's tape teaching a Tele Spin. Said it was probably a mistake where the man got a bit over excited, thus was born the Telespin. In the beginning the Oversway most likely came when the couple went into a Sway and acidently kept the leg out wide instead of closing. The Five Step in Tango was most likely an accident coming from a Four Step. As far as I have read, in those early days there where few moves. But each was clearly defined and had to be done in a certain way. Then along came people like Victor Silvester ( quite a story there )and Maxwell Stewert who introduced the Double Reverse Spin. Many others of course added their bit on how to create shapes in space and how to move to beautiful music.