I agree with this. If fact Alphaunad's realization that the Warrior of Light is an actual person and not just a convenient implement of mass destruction in 3.0 is a large part of what has made me start to warm to his character. With most of the Scions regardless of how much I may like their character have never really felt like friends with the WoL. Allies yes, or coworkers perhaps but if the WoL suddenly lost a leg or the Echo tomorrow and was no longer able to fight, I don't feel they'd stand by them. Feel bad, sure. Send them a gift at Starlight, sure. Maybe drop by if they were in town and not too busy. Hauchefant on the other hand I feel would have done whatever he could have to help the WoL. While he certainly found the ability to fight primals . . . er . . . impressive, the sudden lack of that ability would not have changed his regard.
The Scions are perfectly willing to risk their lives for the WoL and Minfilla in 2.55, but I ultimately felt like it was more because they believed that was the best way to protect Hydaelyn. Hauchefant's sacrifice was only to protect the WoL for no other reason then he did not want a world without them in it.
I've always felt that the surviving members of the Circle of Knowing share a comradery with each other that the other Scions are not a part of. This isn't actually a criticism of how the Scions have been portrayed given that even if you are a Legacy player you don't actually interact with them outside of "work" that much, so it is not surprising. I praise Hauchefant's character more since they managed to give him a more personal relationship with so little actual "screen time" when compared to the other characters.
Still I feel the game is poorer without Hauchefant or a truly personal friendship for the WoL. Perhaps with his sibling declaration in 3.1 the WoL will start to have a closer friendship Artoriel. Was anyone else like. . . "er Artoriel, I really don't think your brother thought of me as a sister" in that scene? Maybe he just meant sister-in-arms?