Nathan -
I was looking at amnesia as a fixable problem with that particular brain. If the "loss" of memory is because part of the brain is missing, then you may be correct. I was looking at it as the memories are not accessible-but are still there in the brain somewhere and maybe, with scientific treatment, become accessible again. Take for instance a stroke victim. They suddenly do not seem like the same person. They don't go skiing and square dancing like they used to. They can't remember how to make those favorite cookies anymore. But-there is still acknowledgement of the loved ones and some memories (even if they get a little turned around). Sometimes the lack of being able to communicate makes it appear that they are "gone" or at the very least "not the same person". I believe that this person is still the same person-they have a problem that is disabling them from functioning like they used to, but maybe someday there will be a little pill that fixes that. As long as the brain is all there, then the memories should still be there. That's how I see it.