So, from what i gathered, is that Grace is a clone of the original Emily, whoever that is, but when Grace was born she was gifted to Alyssa in likely Spencer's final moments. This would explain why she has a bonded attachment to Emily and also, why Victor and Zeno would set out for a clone that was broken free from Umbrella's control. But I'm not sure if that's actually correct, it's not really clarified. Zeno says she's the original which doesn't make any sense as she would've been born after Racoon City. I'm confused on two things is she a clone of Emily? And secondly if she was the key why did Victor keep her in a house of horror death trap, if he needed her alive? Besides it being cool for gameplay the story doesn't really add up. I like this game but the story has so many plot holes and vague with it's narration.