You’re just dropping the ball on every play.
Christ got his incorruptibility when he was buried.
The incorruptibility of which Paul spoke was completely WRT our biological bodies. They cannot withstand the presence of God, just as Christ’s could not, until it was changed.
As to sin, yes Jesus was tempted, as we are. The difference is he was able to resist it to do his Father’s work. That is not heresy.
So, are you saying that the human Jesus needed a Savior?
Think about this... because Jesus says that He lays down His life and He will take it back up again. No one could take it from Him.
John 10:18 No man taketh it from me, but I lay it down of myself. I have power to lay it down, and I have power to take it again. This commandment have I received of my Father.
***They cannot withstand the presence of God, just as Christ’s could not, until it was changed.***
Where does Scripture say this about Christ?
Think about the Transfiguration. Jesus is seen by the three Apostles in His glory. His physical body, not a spirit but the body which was born and died. And this before His death and resurrection.
Tell me then, since you seem to be saying that the human body of Jesus needed a Savior, when do you believe He was redeemed?