Sure back to my original question: So where did the Son come from? If we accept the necessity of a highest power why was/ is there a need for a second equal power and certainly why the need for a third co-equal power? How and why did these second and third powers come to be?
First, the Son did not come 'from'. Jesus addressed the issues inherent in your questions when He spoke with Philip, as related in chapter fourteen of John's Gospel.
In God there is no shadow of turning, thus any expression of God is not coming from rather coming to. That may sound strange to anyone not at least vaguely familiar with Zen. It is however a very valid perspective in a Physics sense. Let's use the analogy of Flatland to explore it.
A being living in a two variable spatial world of length and width only would not be able to sense a three variable spatial object except where it intersects the two variable realm. As a three variable object is passed through the two variable plane, a being in the two variable realm would sense something coming 'into' that realm from some other realm, but the reality of the three variable object is that it is just being itself not coming from anything just intersecting/coming to the plane it intersects.
Jesus answered Philip's request to have Jesus show the disciples The Father, by telling Philip that all they could sense of the Father Almighty is where The Father intersects their realm.
Second, The Son and The Holy Spirit are not 'second and third' powers, they are The Father almighty as expressing in differing variable realms.
The Bible includes an interesting scene in Daniel chapter five, where a hand appears in the palace party central of the resident ruler in Babylon the very night that city and empire fell to their enemies. This hand was attached to a being existing in a realm of variable expressions not sensed by the folks partying with the King, yet that hand reached into their limits realm and wrote on the wall there.
There are many aspects of that story which we could address, but let's just consider what it means for a being to be of 'another' realm of variables yet able to reach into the realm of variables of lower number of variables.
A paper dollar bill can be exchanged for four quarters of metallic money, or ten dimes, or twenty quarters. Are these metallic coins contained in the paper dollar? Of course not. We establish and exchange rate fashioning an equivalency. For our discussion, imagine that I have a ten dollar bill and I want to get change for this bill. Does my exchange source have more than the ten dollars, say as a bank? Probably. Are all the monies at this source available to me for change? Only tot he limit of my ten dollar bill!
If my exchange source has less than an equivalence for the paper money I present for change, can the source 'cash' my ten? No, it is limited to the amount it has on hand. The same may be applied to spatial/temporal realms of variable expression. A lesser calculus of variable cannot sense a greater calculus of variables beyond what the lesser has to make equivalency.
Is this making sense to you yet? Try not to jump ahead, and anticipate where I may be going with this. Just consider the foundational principles inherent in this next point to ponder; we'll step beyond this point when the data is clear.