Hrm... A few years ago William Rufus Shafter was an 11, then fell to 10, and now to 7.
This brings up an interesting project for someone who had access to the Bacon engine. Use each movie's release date to calculate the change in the universe of Bacon numbers over time (which is constantly shrinking), and make a Youtube clip of it, perhaps with ominous music or a narration by someone who does science documentaries for the BBC, or even Kevin Bacon himself.
Unfortunately we don't have enough data to create a system that includes screen time, or shared
screen time (X had a 1:52 second scene
with Y, who shared 7:52 seconds with Kevin Bacon).