It may be the only path available? I'll try to show obstruction balls in the way to prevent any other paths.
That's not necessary. I understand what "only path available" means. I'm not sure you understand my point. I guess it doesn't matter anyway. I'm simply saying that trying to hit 1 of 5 parts of a pocket on every shot is overkill and will probably result in more misses for half table length or so shots. I would never suggest that C or B level players worry about 3 or 5 parts of the pocket until their mechanics are much more precise.