The "Peninsula of Power", in the original game, was a small, two-tile section of the world map that was accidentally coded for the wrong area, allowing players to fight much stronger monsters than they would normally be able to when they could first reach it. This one area was incredibly useful for Level Grinding, and has proved so popular the glitch has remained in all subsequent remakes of the game. Other Final Fantasy titles also had small "Peninsulas" of their own because of this glitch.
I knew about the FF1 bug, and I knew about similar locations like the forest in FF9 where you fight Grand Dragons, but the bolded part caught my mind's eye and prompted a question: could ye olde Leafer Peninsula have been an intentional inversion of the old FF1 grind site?
Leafer Peninsula both isn't entirely covered by one encounter matrix, and has one side whose monsters have notably different power levels. Instead of being new, ultra-powerful beasts you have no business dealing with yet, those fiends are the first random mobs you likely ever encountered when you first made your way to a world map. The fact that you can simply walk to it early into the WOR is also an important similarity, but the peninsula being in the WOR at all also plays into the inversion idea as nicely as the titular Leafers do.
So what do you guys think: glitch, or misunderstood Easter Egg?