So the bird is just there to keep Himawari company? I was hoping it would have more impact than that (that bird pay for the water, which help save Fai). At first I really dislike Himawari, but this last few chapter really change my view on her. As for which couple will be canon, I think that it will mostly likely be Watanuki and Doumeki. Yuuko hints several times throughout the manga that Doumeki is 'the one' for Watanuki, not Himawari.
I totally agree that the way Watanuki feels about Himawari is the same as the way Sakura feels about Yukito. Watanuki is an orphan since little, he does not seem to have any friends at all. Of course he would feel happy around someone who is nice, sweet, and always smile. He mistook that warm feeling as 'love'.
The way Watanuki feels about Doumeki is way deeper. Even though he nevers show it through words, but he shows it through his action and facial expression. He cares more about Doumeki than he likes too. I find this really funny: whenever Doumeki said "I want Xxxx for lunch tomorrow", Watanuki would get really mad. But he would always made Xxxx for lunch tomorrow.
I really like Himawari by the way. So if it HxD or HxW, then I won't mind. It Clamp, so they can pull it off with any pairing (EXCEPT the Watanuki and the Vestal Sprite). But I still cheer for DxW.