You guys talked about all the plot holes in JtO. I gave them a little thought, and here's my solutions(JtO spoilers, obviously):
1. The Crystal door that Upgrades Ekimu. The Toa knew this was a thing already, because Ekimu used it to upgrade them. That explains why they weren't surprised by Ekimu's upgrade, and how they were upgraded.
2. Agil's death(?). Agil flies into Ekimu, disappears, and Ekimu blasts Umarak. This confused me a lot, but then I recalled that Ekimu mentioned Agil's power: he can show people things. He can't actually use his own light powers offensively (if he could, why would he only scratch Umarak with his claws?). And he can't unite with Ekimu, since he doesn't have a Mask of Unity. And Ekimu doesn't have light powers. So there was only one thing left: Agil sacrifices himself, and Ekimu becomes a Vessel for Agil's power, blasting Umarak. And it weakens Umarak, but also bathes him in light energy: the one element that he was missing. Umarak was bathed in that energy, and that's why Makuta pulled him into the vortex: he needed all the elements.
3. Why did that downgrade Ekimu? Well, that's because... someone accidentally deleted the EtMM model. Yeah, I don't have any clue on that one.
4. Why Wasn't Ekimu trapped in the Shadow Realm? He was in the blast radius, too. Well, he WAS trapped. In spirit, anyway. Then, six Toa come along and "awaken" him. Or rather, they brought his spirit back from the Shadow Realm.
5. Where'd the Prophecy of Light come from? Well, Ekimu is stuck in the Shadow realm. So he carves the Prophecy for Gali to find. After all, he knows that she'll be coming.
6. Wait, then how come the Toa didn't die when they Revived Ekimu? Easy. There's a huge difference between transporting a non-physical spirit and a physical being. Umarak used the MOUP to open a physical door, not just a spiritual one. It takes a lot more power to close that.
7. How did the beasts work? I had to really think about this one, and I don't have a perfect answer, but I do have an answer. It's obvious that JtO ignores other story material, so it ignored the MoCo's power from a product description (mind control). The beast are an anachronism of nature: they are made out of elemental crystals (You know, those things that gave the masks there power?), with a Shadow Trap transformed into "duplicates" of the Mask Of control, each one piloting a elemental crystal "mech". When the Toa destroy the Beasts, they immediately begin pulling the elemental crystals together to make a new mech. That is, until the Toa smash the masks.
And now JtO part 2 makes some semblance of sense.
Although I don't know why they made the Groundskeeper an earth villager instead of Stone. That was just dumb.