Now that's a philosophically interesting question. What Keltham really wants to ask is if their personal stories would seem surprisingly interesting to whoever is playing the hypothetical original LARP that this realitynovel is deconstructing. But they're not going to have a better answer to that than he does.
Well, he's the viewpoint character, so... "I think what we're looking is the expected degree to which I, a dath ilani, would say something like, 'Wait what?' after I found out. So the fact that you spent years at the Worldwound would be, like, a third of the way across, because it's surprising and matters to me, while you being secretly a dragon shapechanged into a human, if you knew I'd find that out later in the relationship, would be more like two-thirds across. Maybe let's say it's only past the halfway point if you'd expect other people here to be surprised."