Parshas Bereishis:Adam and the Onesh of Misa

Last week I spoke about the onesh of misa that Adam HaRishon recieved. Rav Elchanan in his Kovetz He'oros , Chelek Aggadata Siman 3 asks why wasn't Adam HaRishon's teshuva enough to remove the gezeirah of misa.

The answer can be based on the following chakira-was the gezeira of misa an onesh or was it just a change in the metzius of the world. Lmashel if one is allergic to nuts and eats nuts and then breaks out in a rash, would we say that the rash is an onesh? More likely we would say that it is a metzius-it is a reaction to the fact that you ate nuts. So too, when Adam ate from the Eitz HaDa'as he changed the metzius of the world and now al karchach there was misa.

Most mefarshim I saw held that misa was not an onesh but a change in metzius. However, ayin the Targum Yonasan ben Uziel that says it was a chiyuv misa.

1) Derashos HaRan: Rav Elchanan quotes the Ran to answer his question. The Ran learns that before the cheit, the nefesh was the dominant part of a person. Therefore, a person could live forever. After the cheit a person's nature changed and the guf became the dominant part and m'meilah people had to die.

Side note: I was told b'shem Rav Aharon Soloveitchik zt"l that this Drashos HaRan is a chiddush not found in Chazal and you only find this idea among the Spanish Rishonim as a reaction to the ideas found in society at that time.
I have no idea if Rav Aharon actually said this but this is what I was told. Clearly, Rav Elchanan had no problem with this Ran.

2) Nefesh HaChaim: The Nefesh HaChaim learns that after the cheit a zuhama shel ra entered a person. Since HKBH is a meitiv, he wanted to provide a tikkun for people. This tikkun is misa. Only through death can this zuhama shel ra be removed.

I would add that this is slightly different than the Ran. Acc. to the Ran a person's nature changed and misa was a direct by-product of this change. Acc. to the Nefesh Hachaim, it is a tikkun from HKBH.

3) The Netziv in Bereishis and in hi Sh'iltos has an interesting m'halach. He says (more clearly in the Sh'iltos) that misa was actually created during the creation of the world. We know that there are people like Chanoch and Eliyahu who can reach such a high madreiga that they can no longer be a part of the physical world. Before teh cheit, Adam was also on this madreigah but with one difference, He was able to be on this madreiga and still live in this world. This was possible due to the nature of the food available to him in Gan Eden (see the Ramban that it was a special type of food). If there was no cheit, Adam would have continued on this madreiga in this world and m'meila he would never had died (as long as he was on this madreiga). Also, anyone else who would reach this madreiga would also live forever (presumably everyone else would die). After the cheit, the only way to continue on this madreiga
was to leave the world (like Eliyahu). Since Adam sinned he was no longer on this high madreiga and al korchach he had to die.