He was the cart driver that c2 was riding on and you could literally see c2s eyes shifting at him after she said "right lelouch"

I have no doubt.

This ending does accept interpretation. Therefore everyone may see it as they wish and this discussion is pointless, unless something like a sequel provides more information and takes away that freedom.
On the other hand word is that the creator confirmed his death to stop rumouring, however to me that makes no difference.

he's dead