He was a prophet as the likes of Deu 18:18, but I wouldn't brand him as "just a prophet".
With this Prophet to be, in the mind of the Father, for this reason (for in him) the Father created all things, alone and by himself for Him Isa 44:24, where after being the firstborn from the dead, he would then literally hold preeminence in all things (Col 1:15, 16, 18).
Re reducing the trinity, you cannot reduce something that doesn't exist
Hear, Israel, Yehowah our God is One Yehowah as quoted by Jesus.
1 Cor 8:6 - yet for us there is one God, the Father (John 17:3), of whom are all things, and we for Him; and one Lord Jesus Christ, through whom are all things, and through whom we.
Through -> on account of, by reason of, because of, for the sake of, Yehowah alone and by himself created all things for the future one, born from Mary.
Known as the firstborn of creation in the mind/plans of the Father, where all your creations begin Col 1:15, Rev 3:14, 13:8.
