That is odd, how Fergus become Teyrn if his land is given to the Grey Warden? In any origin other than HN Howe lands in which includes Highever is given to the Grey Warden isn't it? Or i am wrong? Or it just Amaranthine?
Just Amarathine.
Dialogue from the boon ceremony (Alistair, and IIRC, Anora's is the same):
Let it also be known that the arling of Amaranthine, once the land of Arl Howe, is now granted to the Grey Wardens. There they can rebuild, following the example of those who went before them.
And from an US funeral:
Let all know that the arling of Amaranthine, once the land of Arl Howe, is now granted to the Grey Wardens. There they can rebuild, and hopefully live up to this example.
Even if a HN Warden boon request is that 'the Howes pay for what they did to my family', the king/queen's dialogue is very specific about who gets what:
The Howes are hereby stripped of their titles and fortune, and will be investigated as to their involvement in the Highever attack. Highever itself is of course restored to your family... namely your brother Fergus, since he was found safe and sound near the Korcari Wilds. Let it also be known that the arling of Amaranthine, once the land of Arl Howe, is now granted to the Grey Wardens. There they can rebuild, following the example of those who went before them.
And at a HN Warden's funeral, the monarch gives Amaranthine to Fergus, who demurs:
Alistair/Anora: Fergus, the Highever lands are restored to you... in addition to the Amaranthine arling that was Arl Howe's.
Fergus: Your Majesty... I would like to give Amaranthine to the Grey Wardens.
Alistair/Anora: I think that would be fitting. Let all know that the arling of Amaranthine, once the land of Arl Howe, is now granted to the Grey Wardens. There they can rebuild, and hopefully live up to this example.