Do you see how you jump in quoting Hebrews 1:3?
He - Jesus
His - The Father
His - The Father
He - Jesus
His - Jesus or the Father?
You say the final his is Jesus, but if we follow what is being spoken of in the context, AUTOU would continue to be the Father, not the Son.
If he was created with an ability or power, that power still originated with God, for God gave that to him, so God is still the source of it, is he not?
This is not the only text though. Let us go back to John 5:30, where he plainly says, "I do nothing of myself." In other words, in and of himself, Jesus does nothing. How then does he do what he does? By God working through him, and thus he making use of God's power. Consider Jesus' miracles. We speak of him doing this or him doing that, but was he acting of himself, using his own power? According to Acts, it was God who performed them in him. So it would have been the Father's power.
With that said, I would certainly grant your position with Jesus as a created being as far as he was created with the power and ability, but at the end of the day, I still see that being sourced in the Father as his creator.