He was not that great of a surgeon. He once tried to cut someone open and missed, breaking the knife on the man's belt buckle.
Now when I think of a great surgeon I always think "Someone who tries to kill people, extra points for attempting to kill your friend."
With friends like that who needs homicidal surgeons...err I mean enemies?
That happened during a time of being a troubled youth, during his formative years. That's not the kind of person he grew up to be, or is. He grew up with nothing, living a hard life. I'd say his contributions have more than redeemed him from a stupid mistake he made as a kid.