What is perfection? It is not immortality. Does it in itself result in everlasting life? If Jesus had not been executed, would he have grown old? JWs say "no". Does being perfect guarantee that a person does not grow old? The scriptures do not say. Only in Adam and Eve's case did God say that allowing them to re-enter the Garden and eat from the tree of life would result in life indefinite. He was referring to what would have represented foregiveness - something he was not prepared to extend.
Apparently even perfect people need to be revitalized by God to continue living. Perhaps God would have continued to revitalize Jesus, but he was sent to die and that is what he did.
What about angels? The ones that sinned are no longer perfect. Will they eventually lose their vitality and die? Maybe that is why Satan had such great anger when he was cast to earth (according to Revelation). I can think of many reasons he might have been angry. No longer being allowed to be in the presence of God was probably at the top of the list. But he hated God- right? Apparently, but did being in God's presence "revitalize" him in some way?
The point is, Jesus was perfect but it did not make him immortal. Nor could he could fly, be invisible, have super-human strength, etc. It is unlikely that he would have been the best athlete, chess player or singer... But he was perfect, and it meant something significant.
So the only examples of perfect humans we know of are Jesus, Adam and Eve - and Adam and Eve are dead. Perhaps deciding on what perfection actually means is significant - more significant that what WTC thinks. After all, WTC doesn't even think Adam and Eve ever ate from the tree of life. They forgot that Eve told the serpent that "from all the trees we may eat" - except for the one designated as the Tree of Knowledge. Apparently, eating from the Tree of Life was just a continual promise that they could keep living and be revitalized in some way. They ate until they were no longer allowed to. Then they started down the road leading to death.
Perfection appears to only be the absence of inherited or deliberate sin which is lawlessness. Jesus, Adam and Eve were the only humans who had it, and only Jesus kept it until his death. What's all the disagreement about?