I find you interpretation understandably limited.I would simply conclude your interpretation of 10.38 is problematic.
In the Christian tradition, this parallels Paul's eschatology of 1 Corinthians 15.In John 17.21-23, Jesus uses the same language of mutual indwelling for his disciples ("that they may all be one, just as (kathōs) you, Father, are in me and I am in you"). Unlike later Christian tradition, Jesus clearly equates the type of unity he shares with the Father to the type of unity he wants for the disciples: "that they may be one, just as (καθὼς) we are one" (17.11).
We have two things here: How Jesus' audience heard His words, and how the Tradition understands them. The latter does not contradict the former, but rather illuminates the depth of meaning.If you dare claim the oneness in Chapter 10 means essence but the oneness in Chapter 17 means relational participation, you are admitting that the phrase does not inherently mean ontological equality.
So, as you no doubt know, my belief is that, to quote the familiar aphorism "For God was made man that we might be made gods" (St. Athanasius, and so forth).
Only God can unite creatures to God; therefore, if Christ saves and deifies humanity, and unites all creatures in Himself, He must be fully and ontologically divine, and in that participation is an ontological union – all being arises in God, therefore God is in all being.