I have a world state where my male Cousland did not romance any of the followers but he ended up marrying Queen Anora. Does Inquisition ever address the outcome of Cousland-Anora pairing ?
Yes. There is a codex stating that rumors circulate that the Queen's troubles are due to her being distracted by the Hero's disappearance.
Another codex states that the Hero and Anora lived happily up until he disappeared some years ago.
However, Anora's last name is still written as "Therin" no matter what. And Therin banners still litter the Hinterlands. The swamp I can understand since it was abandoned. But I do not like these oversights.
In Trespasser there is a letter from Anora to Teagan where I think she refers to herself and the Hero collectively, like "You've been a loyal friend to us", or something like that.
Also, I read a rumor that if you have Leliana as the Hero's mistress, the letter to Teagan from Anora mentions this and shows her disapproval. But I can't confirm this.
I know that the game addresses Leliana being mistress to Cousland if he marries Anora but does the game adress a Cousland who did not romance Leliana or Morrigan or Zevran that married Anora and remained faithful to Anora ? Any cutscenes ? Or dialogue options ? Or is it ignored ?
It's not ignored, but it isn't featured nearly enough.