Forum:Who's the Bigger Bad of the series?

I know, I haven't seen The Final Act yet but I've read a bit into it, and I'm close to it. Naraku's the main villain, but who's the "bigger villain" behind him?

Initially it was said it was Magatsuhi, but now with the revelation that he and the Jewel's Demon are two separate entities (though one was created by the other somehow), who is it? Magatsuhi, the Jewel's Demon, or the Shikon Jewel itself?

I do know, the Jewel forced Naraku to make a wish on it that when he dies, his soul and Kagome get sucked into it, as part of some plan to maintain its existence. It'll probably be clear once I watch it, but when did he make the wish? Was it right before his death, or was it when he killed Kikyo and took the Jewel 50 years ago?

If the former, then Magatsuhi can't have been behind that coz Sesshomaru killed him. So, did the Jewel's Demon have any influence on the Jewel's will (as I read it has a voice, it must have been an entity of its own), or did the Jewel manipulate Naraku on its own? What was its involvement in Naraku's creation? As far as I've seen, the spider demon was behind it when he made the deal with Onigumo.

With what I know now, it sounds like the Jewel is the final antagonist of the series, like the Shadow Queen in Paper Mario: The Thousand-Year Door, the demon Grodus (the main villain) seeks to revive by having her possess Peach as part of his plans, intending to command her, and then she overshadows him and is the final boss of the game.

And why did it seem like Magatsuhi and the Jewel's Demon were mistaken for one and the same for four years, until I was almost done the series? (at least it wasn't too late)

Of course I have questions about how Naraku really died (before his soul was sealed inside the Jewel, everything after that is clear), but I'll decide how it goes once I've seen it.