Got to say dennis that has been my shout for the last 4/5 years. It's not rocket science to try to make space and give the thrower an option. All we seem to try and do is put as much distance between the thrower and the receiver.
How often do we see our thrower waiting for someone to make a quick move into space. Robertson was hanging on to the ball for a minute or more waiting for someone to get open...but it never happened. Looks like we never practice getting open or quick throw ins.