No. The Earthbones are the spirits that completely gave themselves (as opposed to what the aedra did, which was give a piece) to create Mundus, and give it its laws of physics and such.

The spirits that left with Magnus are known as the a fourth classification that I forgot about. By the way, they want nothing to do with Mundus at all. Heck, it is sometimes surmised that Meridia was once those people, but Magnus tossed her sorry butt out, because she was flirting with people outside the Aerithus, and is now the daedra of illicit spectra and radiation.

One of the spirits that gave themselves completely; I know that much. But from where did they come? When Anu and Padomay fought, their blood made the et-Ada. So where those spirits part of the et-Ada?

Haha, so Meridia wanted to leave into the Aetherius with Magnus and the et-Ada, but he kicked her out because she was flirting with those other et-Ada? Really? Does it literally say that somewhere?

"Now when the Daedra Lords heard Shezarr, they mocked him, and the other Aedra. 'Cut parts of ourselves off? And lose them? Forever? That's stupid! You'll be sorry! We are far smarter than you, for we will create a new world out of ourselves, but we will not cut it off, or let it mock us, but we will make this world within ourselves, forever ours, and under our complete control.'

"So the Daedra Lords created the Daedric Realms, and all the ranks of Lesser Daedra, great and small. And, for the most part, the Daedra Lords were well pleased with this arrangement, for they always had worshippers and servants and playthings close to hand. But, at the same time, they sometimes looked with envy upon the Mortal Realms, for though mortals were foul and feeble and contemptible, their passions and ambitions were also far more surprising and entertaining than the antics of the Lesser Daedra. Thus do the Daedra Lords court and seduce certain amusing specimens of the Mortal Races, especially the passionate and powerful. It gives the Daedra Lords special pleasure to steal away from Shezarr and the Aedra the greatest and most ambitious mortals. 'Not only are you fools to mutilate yourselves,' gloat the Daedra Lords, 'But you cannot even keep the best pieces, which prefer the glory and power of the Daedra Lords to the feeble vulgarity of the mush-minded Aedra.'"

Meridia's holdings in Oblivion are collectively known as "The Colored Rooms". Another Prince whose origins may not entirely be outside of the aetherial, Meridia has at several times been linked to Magnus the Sun. The most famous account of this association is the Tract of Merid-nunda, which overtly casts Meridia in the role of a wayward solar daughter, cast from the heavens for consorting with illicit spectra.

Ohh, I think I might be getting it. http://www.imperial-library.info/obscure_text/cosmology.shtml

...Magnus then left, some say in disgust, and Oblivion filled in the void with the Void. His escape was not easy, and tatters of Magnus remain in the firmament as stars.
So all the other holes are not created by the daedra, but they're actually just the other rips in the edge of Oblivion that Magnus made when he left? Oblivion is a sphere in another dimension right? That would explain why all the holes Magnus left are the same distance from Mundus. So, if Magnus was a bee, it'd be like he was a bee stuck in a spherical cloth container. And this bee buzzed it's way through the fabric and left a big hole. But some how, as the bee did that, it also left many other holes all around the inside of this cloth sphere, albeit, much smaller holes.
So does that mean that Magnus is in Aetherius now? I mean, where did he take off to?