Who is to say that the Twelve even exist? When Louisoix attempts to summon the power of the twelve at the end of 1.0 to defeat/recapture Bahamut the only thing we see is a powerful spell with fancy symbols that are ultimately very easily brushed aside by a Primal, which you've essentially just said are fundamentally lesser (and presumably weaker) than the Twelve. Considering the Twelve have never spoken to us, or anyone that we have actually spoken to, and their presence in the world is almost entirely non-existent, and the fact that they basically described summoning them into the world would be almost identical to summoning very big Primals, it could be speculated then that the Twelve are actually just the Primals, perhaps the real Primals. In other words, Shiva could very well be the real Halone, or perhaps an aspect of her. There are other parallels you can draw here too but I won't go into that, my strongest evidence is still that Halone is based on the real world Shiva.
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