My linear timeline theory. You can read more at the thread Linear Timeline Expanded.
Also the idea that Tantari and Parapa were the Rito wind sage and Sheikah shadow sage of the Zelda 2 generation.
I also think my map overlay theory is pretty odd, especially the idea that Labrynna and Minish Cap Hyrule are essentially Akkala, and Holodrum and Zelda 1 Hyrule are the same land, and Death Mountain from Twilgith Princess is actually BotW Hyrule castle.
Skyloft being City in the Sky is a great theory; I would add the Wind Tribe's Home as another Sky Island in the same vein.
Also love Mikey's Wheel timeline and definitely think it's preferable to the current split.
For Frax's theory, is the light that he photosynthesizes sunlight or the light from the Light Temple? Maybe he absorbs Rauru's sacred light and that's what sustains him, idk.