I have redrawn the shot below with everything closer than half a ball to the original diagram and drawn in the no-cushion option. Is this what we're talking about here?
View attachment 431489
Yes, that looks ok to me. I would contend that from that position of the balls a player could not cleanly pocket the 8-ball and draw the cueball to the end cushion without touching the side cushion. I'd love to be shown it's possible though.