You're right, of course, which is why I think about how this might turn out into him dying or ascending into champion status. After all, in the world of Runeterra, you usually end up either becoming fish, or fisherman, the League of Legends are those who have become the fisherman. I DO enjoy him being this average joe guy who just happens to survive, but in the face of not one, but multiple Harrowings... you either need to be extremely lucky, or you have something special about you.
He may just be an average guy, but staying average and living in the world of Runeterra, where void-creatures roam, there is constant war and strife (and the League no longer exists to maintain stability), and the undead come to say hello every now and then, are rather mutually exclusive.
If he dies, well sadly it proves the point that he was average in the end, and eventually things catch up when that which is exotic seeks you out, but if he doesn't die and survives, well, maybe there is something more to him.
Or maybe he is just an extra who survives simply because the plot never caught up to his death.