The fifth photo gave me an impression that it was a Brahminy Kite due to the paler head and breast and darker lower belly, it was the first thing which came to my head. But I do agree that the underwing is too pale after looking at different photos of Brahminy.
I guess Buzzards have such wide variety of colourations, I won't be surprise if there are some out there with dark belly, dark tail, pale underwing and a pale upper body...Though I have never seen Buzzard with colouration like this, not saying it doesn't exist, as I have seen limited amount of variations!!
The thing which bothers me now is that it's tail looks too dark, Brahminy should have paler tail feathers. Or is it just the lighting in the photos??