dorsal "ridge" and dewlap convince me that it is indeed a gaur . . . i am one of the few who have actually seen them in their native habitat . . . not really familiar w Banteng . . . are they related to Gaur?
Wrong. Banteng also have a dorsal ridge and a "dewlap". The key is tail length and the space between the horns. Gaur have hair in this space, Banteng have this thick, keratinized tissue thats really rough. Look at the picture I posted above of the bull banteng I work with. That picture really looks more banteng than gaur.
Gaur are Bos frontalis (gaurus), banteng are Bos javicus (javanicus). They are closely related, thats why there is so many mistakes with identification. Gaur are larger.
Heres a side picture of a Banteng taken from the Ultimate Ungulate webpage----probably the best online resource for hoofed species information.
this bull is related to the bull I posted pictures of---he's the old male that used to be at the St. Louis Zoo in Missouri.