The whole deal with the Trinity concerns the essence of being.
The orthodox belief in the Trinity teaches that Jesus is God, and JW's will agree that Jesus is a divine being. The orthodox Church Fathers' opinions differed and at the two extremes we may think of Athanasius and Arius and their ideas.
My understanding is that the essence of the Divine Being is like, (if I may use the illustration), an amount of water, the water of life--and that the son is poured as a cup of that water, it is separate, only a cup of that essence, but having the same source. The Holy Spirit is like a stream of this water. It flows from the source; it has power. But it is of the same essence even when it is sent forth to accomplish something.
If the Father is the essence and source of this water, people may have seen Jesus, and felt the power of the Holy Spirit, but we aren't close enough to God, we are separated from the essence of life, the source. Jesus was the cup that was poured out on behalf of humanity to bring them closer to the Essence of life.
Anyway, that's my understanding, and all the quibbles and quarrels between trinitarians and unitarians has become a lot of noise to me.