Center's description has nothing to do with drive-shaft angle per se. The cartoon shows an exaggerated pinion/ tranny output shaft offset for effect but the main message is to set the pinion centerline parallel with the tranny shaft centerline, no matter if there is offset in the centerlines or they are perfectly lined up. The first cartoon is the ideal, but the second is great, and is in fact the norm - look at those cartoon-like 4-wheel drive trucks w/ drive shafts @ nearly 45deg angles. As long as the two shaft centerlines are parallel (and the U-joints are in phase of course), things are fine. The last two pictures are absolutely forbidden if you want the drive shaft under the car for any length of time.
The point being, the question in the initial post is incorrectly configured. 6* down for a pinion angle by itself has no meaning. That measurement is meaningful only if the tranny shaft is 6* up.