Why did JKR not explore H/Hr as canon?

[laperchette]

No: HPFGUIDX 168691


> 
> honeypi:
> 
> It's a bit early to say H/Hr won't be cannon.  

laperchette:

I agree! Not because I'm a HG/HP-shipper, but because Rowling said that 
her favourite twist in a book is the shipping-twist in Emma. So I think 
she wants to have some similar surprises, too in her last novel. 
To stay with the relationships how they have developped so far would be 
too boring. But I'm not sure whether we will have HG/HP or other 
unexpected pairings.

On the other hand: alchemy speaks for RW/HG. Hermione is clearly 
mercury and that has to be paired with Sulfur (Ron), so that Salt 
(Harry) can stand alone.