It looks to me like after the call they are all standing on the same spot??? Am I loosing it, cause your book says that the right most couple goes first even from in-facing ends lines. Aggghhh.
The square-breathing of the above example is tight, which makes it difficult to envision the actual traffic pattern. The key is to concentrate only on one line of 4, since Cycle & Wheel is a 4-dancer call.
The Right-End and adjacent dancer do their movement & step forward a bit to become Leaders as the Left-End and adjacent dancer to their normal movement.