We have established that only one thing can be “existence itself”. Everything else must not be existence itself. That is, everything else must receive and not be identical with its existence. It must not be existence itself but must receive some finite “cut” of existence proportionate to its kind of character.
(Implicit here is another proof for God’s existence. We know that of the many things that are only one of them could be existence itself. Since there are many, at lest all but one receive their existence. Not from themselves, since in order to supply, they would already exist. But on the supposition they don’t exist. Therefore, they receive it from another. If that receives its existence, then from another. Etc. Unless we come to one that does not receive but is its own existence, then none will have the wherewithal to give existence to another. If none has that, then nothing could be. But we clearly see that many things are. Therefore, we must conclude that Being Itself exists. Now, this argument entertains the notion of secondary creators. I shall go on to argue against the idea of secondary creators.)
Given that for each thing that is not existence, its existence cut to a certain kind, it is by no means infinite in power. It rather (at best) has a range over which it is competent. But nothing that (at best) has a range over which it is competent has competence over the very “being as such” of anything, not even itself. For everything that lacks competence over being as such must, in its causal activity on another thing, presuppose that other thing’s being. It can affect or arrange or rearrange that thing. But it cannot “create it out of nothing”.
Now, a creator has competence over the very “being as such” of what it creates. If nothing but the True God has this competence, then nothing but this True God can be a creator.
On these grounds, then, the belief of these Mormons that some will (or can) become Creator gods is proven false. No one but the One True God can be creator. Nothing else has any “potential” to become creator God.