Nice, I'm so glad someone is finally explaining this like this. I've tried in the past and have met with much resistance. This should clear up many zoning issues people have when they begin. Other than the other errors people make like kvps on the spawners, missing spawners, and cut versus copying zones, and how that affects kvps.
Here is a thing I tried to explain some time ago, not sure if you can use any of it:
(https://www.ugx-mods.com/forum/proxy.php?request=http%3A%2F%2Fi59.tinypic.com%2Ftapxfd.jpg&hash=2120ef7cf12ee1bf16cb4edb7637f0a93335e095)
I made on on UGX too, slightly different, but can't search UGX atm, and don't remember where it was.
+1