Your explanations regarding the loss of free will by the beings in heaven are interesting to say the least.
Where did you get these explanations from? I do not see your explanations the Bible.
Catholic Church.
Jesus was a perfect human, he couldn't die from natural causes.
That's a JW interpretation. Adam and Eve were "perfect" too but they needed the tree of life (to sustain their lives?).
Mary has no original sin too and she probably died too.
https://en.m.wikipedia.org/wiki/Dormition_of_the_Mother_of_God
Every soul is perfect in structure that's why it's immortal.