If you think about it, this theory actually makes perfect sense. After Harry (and Dumbledore), Ginny would be the only person left alive who had ever had a close relationship with Voldemort. We know that the connection between Harry and Voldemort went both ways, thanks to the fragment of Voldemort's soul attached to Harry's, but Ginny being possessed by Tom Riddle inChamber of Secrets would have also given her unique insight into Voldemort's character.
Harry caught glimpses of Tom Riddle in the Pensieve, but Ginny spent a year with him. Yes, she was being manipulated and abused during that period, but don't we think that would give her an understanding of his character that perhaps not even Harry had?
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If Harry were to die in Deathly Hallows
RandomFan theory that suggests Ginny Weasley would have killed Voldemort if Harry Potter died in 'Deathly Hallows'