[quote=Gowi]
But he's written the outcome. So why does it matter if he hasn't written a short story?
[/quote]

I'm looking at it on a micro-level, not a macro-level.

Dunc and Egg get thrown into a conflict between Osgrey and Webber. I don't know if you read the Sworn Sword, but Osgrey and Webber are very big characters in it. I wouldn't be okay with someone playing Dany, or Jon Snow, or Dunc, or Egg. And had the request for either Osgrey or Webber come at ANY OTHER point in the timeline, I'd of been okay with it. But that'd be direct conflict with the Sworn Sword, and I didn't want to do that.