So I was thinking, if that is helgrind on the front of "the fork, the witch, and the worm", then that dragon must be the size of belgabad. (If you don't know who he is, he's a gigantic Dragon skeleton on vroengard). The proportions are about right. And just think of how galbatorix "died". A flash of light, an explosion, sound familiar? I think he transported himself and Shruikan's eldunari to vroengard. Galbatorix probably would have made him disgorge his eldunarí immediately, and could you imagine how great a 2 inch eldunarí could be? So what if all the energy involved melted Shruikan's eldunarí all over Galbatorix's gloves(cut from the wings of belgabad himself) but the eldunarí kept Shruikan's consciousness in it? Then, at vroengard, the shock wave from the explosion somehow grabbed all the loose energy(which there was a lot of), brought it to galbatorix, and all the energy took the bones of belgabad and made it a new body, Galbatorix. He did have the gloves cut from his wings with Dragon soul all over them. And, as glaedr said, matter is only frozen energy. Then he flies to northern alegaesia, to kill murtagh and thorn.