Not what I'm saying. I'm asking why give him amnesia if it is going to functionally change nothing about the character or their approach to the new world?
It's like if you wrote a character to have no arms but gave them telekinesis that perfectly mimics the function of arms, which they never use for things other than what arms can do. It is flavourless fluff, a waste of an idea. Do something with it, or don't add it.