Well ronshua you have a big "flaw" in your thinking. Your assuming the Trinity is about 3 gods, therefore your conclusion will not follow your premise. You just said, "If Jesus was the number 2 god in the mysteries of the Trinity,"
The second big "flaw" in your thinking is the idea of "why isn't he addressed as God the Son or "god Jesus anywhere?" Do you really think that things have to be addressed exactly as you say so? Many issues in the bible are resolved by "deductive" reasoning if the premise is true then the conclusion would be true.
I will give you an example of what your doing. Premise 1, There is no mention of God the Son in the bible. Premsie 2, if there was a God the Son in the bible, the bible would have mentioned it. What your presenting ronshua is a classic case of an argument from silence.
Now, since Thomas declared at John 20:28 to Jesus Christ personally that He/Jesus was his Lord and his God why can't Jesus Christ be "God the Son?" In fact, to say the Father is God is equal to saying "God the Father." In like manner to say "the Son is God" (like Thomas declared) is equal to saying "God the Son." Nobody is saying there are two gods, there is only one, one, one God, period.
Regarding the term "Godhead," it simply means "Deity." So in my Bible Colossians 2:9 reads, "For in Him (referring to Jesus Christ) ALL THE FULNESS OF DEITY DWELLS IN BODILY FORM." The problem you oneness face is to prove or show that Jesus Christ is God the Father and God the Holy Spirit. Secondly, you have to prove or show that Jesus Christ did not pre-exist His incarnation or His birth. Even in the Colossians verse I quoted, since all the fulness of Deity dwells in bodily form how can Jesus Christ not pre-exist? What part of all Deity in Him makes Him not pre-exist?
IN GOD THE SON,