I do have a clue.Obviously you have no clue. Zone blocking has been around before Denver made it famous. We were zone blocking in high School. Leading with the same foot to your area, creates the crease for the RB to cut back while leaving the backside unblocked. I'm not saying Brad Scott invented it. Brad didn't install it until 1996. https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.goupstate.com/article/19960911/News/605185567?template=ampart&ved=2ahUKEwjvuOvko-nrAhWOVN8KHTtVCs4QFjAHegQIBhAB&usg=AOvVaw06PDsUVA-_3gMnwaasZipy&cf=1
You are missing most of the scheme..... ("Zone blocking is playside and the backside leading with same foot").
It's way more than footwork....it's who blocks who, who moves on the the next level, how the RB responds to what the blocking is giving him, etc.
There are many plays designed to work with this scheme including option plays (zone read).