This is a great document and very enlightening. Thanks for sharing.
Here's my attempt to visualize this:
Based on my reading of the document, any user in one of the green functional areas could use a "View/Print" license instead of a "Light User" license as long as they meet the requirements of a "View/Print" user in the Activity chart above.
There is also the issue of ratios. The light user to heavy user ratio may not exceed 2:1. I haven't found anything yet about a View/Print ratio.