Never thought of how the "current" brain of the Monster is actually mortal (Igor's). That being the case, since the body presumably can't survive without the brain - or at least without a brain modified to replace the original immortalized brain - the transplant in GoF would have been a death sentence to the Monster, slowly reducing him to a vegetable (which he seemed near to becoming in A&CmF) or eventually just killing him outright. Sorry if that point's been brought up before, I haven't read most of the older posts here...but without the proper brain to run the carcass, might the Monster actually have perished after the fire on the dock?