No the only difference between what you suggested and what I suggested is that I like the idea of upgrading the people on a cellular level which avoids changes to character design where as you want everyone running around in Ironman suits. I don't care about any previous theories you've come up with, and there is no way that what I'm suggesting would be inferior to the seraphim who are mindless and simply follow orders. If there was a way to upgrade regular people to the level of the seraphim you could upgrade people who already have their own logic, reasoning, combat experience, and a will of their own allowing them to use haki which the seraphim can't because they have no free will. Litteraly the only differences between what I suggested and what you suggested are that you want the power up to be in the form of a gay ass super suit that would force oda to change the design for every character wearing one, whereas if the power up comes from a serum or a perfected artificial devilfruit the power up happens on a cellular level which avoids oda having to put everyone in some lame power ranger suits. The possibilities of what all the power ups can do is irrelevant to this discussion, I'm merely pointing out that power suits are a temporary and inferior option as opposed to something that would be a permanent boost.