Mammale (and anyone else) I have a thought experiment for you
Imagine the following two scenarios:
1) Reuvein is quite sick and one by one his organs are failing. Luckily for him Shimon is compatible and Reuvein recieves Shimon’s pancreas, kidney, lung, intestine and heart (none of this is sience fiction, though all to one patient hasnt quite happned). Obviously Reuvein’s Posek recognises brin death otherwise he would be inconsitent if he allowed him to recieve the Heart. Well unfortunalty Reuvein gets badly burned and undergoes a face and hand transplant as well. (Still no science fiction) Reuvein now looks like Shimon, has Shimon’s fingerprints and the bulk of his internal organs where once Shimon’s. Who is Reuvein? Whose wife should eh go home too Mrs. Reuvein or Mrs. Shimon?
2) Instead of giving Reuvein all of Shimon’s organs. The Doctors figure lets just remove Reuvein’s functioning brain and put it in Shimon’s body (Now this is science fiction, but who knows…)”reuvein” now wakes up and he too has Shimon’s fingerprints and the bulk of his internal organs where once Shimon’s. Who is Reuvein? Whose wife should he go home too Mrs. Reuvein or Mrs. Shimon?
Now granted this doesnt prove anything. And all the “thought excercises” in the world are irrelevent to since only halacha matters.
But I think all would agree that the Brain is the seat of personhood and since Shimon’s brian was reomved in the second case although the rest of his organs including heart are still functioing. shimon has died and Mrs Reuvein Should get used to being married to a guy who looks like Shimon
thoughts?