He came back to try and fix things--found it was fixed and...his world didn't change. I don't know how. If timelines diverged or...I don't know how. But he's you. Mostly. There are...differences.

But the scar he got after he got Claire's healing ability....so. It is...possible. Somehow.

...Not that that's really something to make it suddenly as...intriguingly sexy as it was.