Solid article, but one very important detail that they left out is that this only really applies to at least league level and above players. Most of this is moot for the recreational, a few times a year type bowlers.

80% of the folks that walk in the door of a bowling alley are going to grab plastic house balls and bowl straight (or try to put hook on it, which isn't overly effective for a number of reasons). Most of this information only applies to bowlers using a ball with a coverstock and core that cause the ball to naturally hook a certain way.

Nothing wrong with being a recreational bowler or bowling straight. It's just trying to apply these statistics to a straight ball doesn't quite work.