The truth of Justification that brings peace with God is foundational and is the Doorway to Grace.
The Sanctification of the Spirit in the working of Grace giving the hope of glory is developmental.
The Tribulations and Suffering that accompany the working of Grace, keeping our eyes on the prize of the high calling of God in the priesthood of Jesus is perfecting/maturing, preparing us to die in faith, die in the Lord, waiting for his appearing and the redemption of the Body, the hope of Israel, to enter in with Jesus in his everlasting priesthood under the principles of Melchisedec.
In the epistle of 1 John, in chapter 2, it is called: childhood and forgiveness, youth and victory over the wicked one, parenthood and being known of him who was from the beginning.
This three-fold salvation of God in his grace is presented by Peter, John and Paul in distinctly different forms of human speech, but in the unity of the Spirit. Each begin with the blood of Jesus and finish/mature with the ministration of the Spirit. James begins with sanctification and its accompanying tribulations and finishes with maturity as a human ministry in the social fabric of life, as it relates to the poor and widows and orphans and the sick. The history of Paul shaving his head at the request of James gives us to see the place for the ministry of James. James also gave his approval of Paul's ministry.
Let us accept each other in Jesus Christ our Lord, which ever one of the streams of revelation by which the Lord has gathered us unto himself. Let us not forbid and not condemn or ridicule. Let us each witness to the grace that God has revealed to us and wait for the angels to separate the wheat from the tares, the good fish from the bad fish.
Joe