"Tony's birth announcement is about ninety percent of it. There's no motive to hide a twin, no motive to do it for fourteen years, no realistic chance of successfully doing it for fourteen years with such a high-profile family, and then when you showed up in public you behaved eccentrically, neither you nor Tony explained where you came from, and while there are plenty of theories about that you were only able to appear in the same place at the same time via sophisticated holograms I don't buy it, in large part because he left a body and you're talking to me. I don't have enough information to determine when you were either cloned or conjured up, though."