[He wouldn't expect an answer like that to satisfy him, but...
Different timelines. He finds himself unconsciously nodding, like that makes perfect sense to him. Why hadn't he thought of that before? They've already travelled across dimensions to get here, so wouldn't it be more realistic to say they're not from the exact same timeline?]
So in other words, it's not your heart that he has inside him, but the heart of another "Sora" from an alternate timeline who never woke up.
[Too bad Roxas never explained the Data-Sora thing to him. Add can only assume that the test occurred at a later point in this Sora's timeline for now.]
[Private to both]
Different timelines. He finds himself unconsciously nodding, like that makes perfect sense to him. Why hadn't he thought of that before? They've already travelled across dimensions to get here, so wouldn't it be more realistic to say they're not from the exact same timeline?]
So in other words, it's not your heart that he has inside him, but the heart of another "Sora" from an alternate timeline who never woke up.
[Too bad Roxas never explained the Data-Sora thing to him. Add can only assume that the test occurred at a later point in this Sora's timeline for now.]
What do you know about Chang'e? About Roxas.