Well, Hades is supposed to be a mechanized Hydranoid, like Altair's supposed to be a mechanized Skyress (I'm not positive on Altair/Skyress, that's just my theory for right now).
Yeah if you look at the shape of both skyress and Altair you can see a similarity. Also I think the just took Hydranoid's data to make Hades because remember that weird collector dude has a statue of Hydranoid.Also I really do think that Spectra is Mira's brother there's only one thing that points me away from it and thats Mira recognizing him tossing the Bakugan and catching it. I don't think they would give that bbig of a foreshadow. However things do point to it:He uses Pyrus Bakugan (Look at his ball in Mira's flashback)Spectra is the only guy who wears a mask. Now why would you need it unless you had something to hide?Mira keeps saying "I hope youa re fighting to free the Bakugan" him not fighting for the Bakugan is just something that people would do. Thats how stories work.