(edited by Roxhemar.6039)
Whisper's Keeper outside Raid instance
It sure would be nice, if the NPC would react to your progress in the raid.
However, in case of defeating Scarlet, that was something ever player had done (at least that’s how history tells it) so this would have been a general change in the Council NPCs.
Connecting a dialouge with raidprogress should be possible, but more difficult to implement. Probably too much effort for just one conversation.