The answers to all the questions we need to know are there already in the text and it's lazy to ask JKR to spell them out for us.
That's why, despite the fact that she says George never gets over Fred's death, I know that George is going to be OK. His ear was a metaphor for Fred -- the ear can't grow back, and there's a gaping hole where it once was, but George bounced back, told jokes, managed without it. He's going to be fine, not the same, but fine.
I think like some of her backstory notes (the class list, etc.) what JKR says in interviews is kind of like WIP notes. This is what she's imagined, but she hasn't written it all out yet to see if it would work/make sense. Suppose book four was the last book and she said in an interview, "Well, I've always imagined Arthur Weasley would die in Harry's fifth year." Then she goes on to write the fifth book and finds out, you know what, Arthur dying doesn't fit -- well, that's it. She didn't lie, she changed her mind -- and if she was ever to write, "Harry Potter and the Peaceful Nineteen Years" she may find that Harry, while still wanting to fight dark wizards and dark magic, just can't manage to do it in even a revolutionary uncorrupted Auror department (he was never one for a chain of command and organization)-- or maybe he'll follow Ginny around as a Holyhead Harpy groupy and solve mysteries on the side...but I think that the future is open no matter what JKR's interviews relate.
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That's why, despite the fact that she says George never gets over Fred's death, I know that George is going to be OK. His ear was a metaphor for Fred -- the ear can't grow back, and there's a gaping hole where it once was, but George bounced back, told jokes, managed without it. He's going to be fine, not the same, but fine.
I think like some of her backstory notes (the class list, etc.) what JKR says in interviews is kind of like WIP notes. This is what she's imagined, but she hasn't written it all out yet to see if it would work/make sense. Suppose book four was the last book and she said in an interview, "Well, I've always imagined Arthur Weasley would die in Harry's fifth year." Then she goes on to write the fifth book and finds out, you know what, Arthur dying doesn't fit -- well, that's it. She didn't lie, she changed her mind -- and if she was ever to write, "Harry Potter and the Peaceful Nineteen Years" she may find that Harry, while still wanting to fight dark wizards and dark magic, just can't manage to do it in even a revolutionary uncorrupted Auror department (he was never one for a chain of command and organization)-- or maybe he'll follow Ginny around as a Holyhead Harpy groupy and solve mysteries on the side...but I think that the future is open no matter what JKR's interviews relate.