I never read it though
I said it was stupid if it clashed with game evidence and simple logic and how CT and CC tied the FF together.
Well, the age thing might be right. Since we don't know when the older Kid went back in time. For all we know, she could have been 30 when she goes back to save Serge. If Kid was around 10/11 during the burning orphanage, it would still make sence.
We know that Wazuki didn't turn fully (we can speculate) rouge and into Lynx before 1010AD. When 1010AD occured, that was when Wazuki lost control and Lynx finally killed Serge. Lucca's house burns only after 1010AD then. In one timeline, Lynx goes after Lucca, but she hesitates to unlock the lock. So in the other dimension, Lynx goes after the Dead Sea's flame (I don't think FATE would attempt abducting Lucca again (not to mention that Lynx can't jump dimensions with her in Home World). And because Kid was roughly found by Lucca in 1004AD, then Kid would be exactally 11 during the burning orphanage and making her exactally 16 (her CC age) in 1020AD.