White-throated Hawk vs variable (Chile) (1 Viewer)

I have just returned from a trip to Chile, and there will be many more questions and confirmations coming, but here is the first one.

I saw a very white hawk in central Chile near some Notophagus forest, in a location (Vilches) where I also saw several Variable hawk. Basically, I only saw the underside, and it was basically similar to the form of variable hawk that has white underside with dark hood except that this bird did not show any signs of the strong black subterminal band on the tail that VH has. The bird I am talking about had a strong secondary bulge and a rather narrow hand; Jaramillo's book states that the trailing edge of the wing is straight in WtH, contra what is shown in the drawing. The bird I saw had darker flight feathers than coverts, and I did not see dark on the sides of the body if it was present (low fly over, from straight ahead, no views from the side).

So the questions are:
Can this observation be explained by variable hawk, does that species show adult-like underside without black tail band?

Can this observation be explained by WTH? Which shape of the wing does this species really have?

thanks
Niels

I may finally have answered one part of my question, because I found this image of a WtH that clearly shows a secondary bulge and not a straight back edge of the wing.

The Ebird range map for the species shows observations from the area I visited.

The other half of the question still remains: can Variable Hawk occur with whitish underside but lacking black subterminal band on the tail?

Niels

Hey Niels,
I think you are pretty safe to say that it was a WtH because of it having having the terminal black tail-band. In regards to your second question I don't think I can help you.

Check out my blog and see if you visited any of the places I talk about.
Take care

Thanks Erik!

That name sounds very nordic?

Niels

Hey Neils,
Yeah the last name is Norwegian.
Take care