Unless God simply spoke man into existence, as he did with light, then any "forming" or "creation" of man is by definition a gradual process. To equate, or consider this analogous to evolutionary mechanisms, and especially, transitions from one distinct form to many other distinct forms over billions of years is a stretch as far as I'm concerned. Specific to the word in question, Strongs Hebrew definitions does include an interpretation to a "potter" as you suggest, but there is also no implication of a gradual process. If that was truly the important point that God wanted to relay, then one would think that such a concept would be implied by the many definitions in the word itself, Unfortunately for you it does not.
Here is the word in question:
3335 yatsar yaw-tsar'
probably identical with 3334 (through the squeezing into shape); ((compare 3331)); to mould into a form; especially as a potter; figuratively, to determine (i.e. form a resolution):--X earthen, fashion, form, frame, make(- r), potter, purpose. see HEBREW for 03334 see HEBREW for 03331
It seems to me the deliberative, and personal nature of the act is tantamount, rather than any temporal correlation it may have.
You're free to believe what you want, but from my perspective, I think your reasoning is seriously flawed.
Aww, jeez, did I write that? I meant paramount, not tantamount. I've got to stop staying up so late...