None of that affects the context of Rev 20 being about the first of two groups to resurrect. That is what the first resurrection is, the first group to resurrect. Jesus is not being called the first resurrection in Rev 20.
If you apply the following Rule of the Spirit/Truth, you will have a more clear understanding.
God always Speaks Truth and HE only needs to Say it Once for it to remain Truth.
Because God is rich in Mercy, HE will Speak more then once when HE is emphasizing Truth for us.
God has Spoken more then once on CHRIST HIMSELF being the Resurrection.
The Law of TRUTH is that it is irrevocable when the TRUTH has been determined by GOD to be such.
CHRIST is the Resurrection = Irrevocable TRUTH
CHRIST is the Authority and SOURCE of the First Resurrection = Irrevocable TRUTH
“Most assuredly, I say to you, he who hears My word and believes in Him who sent Me has everlasting life, and shall not come into judgment, but has passed from death into life.
25Most assuredly, I say to you, the hour is coming, and now is, when the dead will hear the voice of the Son of God; and those who hear will live.
26For as the Father has life in Himself, so He has granted the Son to have life in Himself,
27and has given Him authority to execute judgment also, because He is the Son of Man.
28Do not marvel at this; for the hour is coming in which all who are in the graves will hear His voice
29and come forth—those who have done good, to the resurrection of life, and those who have done evil, to the resurrection of condemnation.
30I can of Myself do nothing. As I hear, I judge; and My judgment is righteous, because I do not seek My own will but the will of the Father who sent Me.