Monster = Tong (SPOILER)

There is some similarity with Tong and the monster. If they are th same person, as I beleive they are, that colud fill a lot of blanks and explain some parts.

Theres also the scene close to the start of the film when we see the monster running, like chasing Keng. Then we see this other guy, Tong who appears from nowhere to be Kengs partner. Theres his fact that Keng always shows his affection, but Tong is totally appart, he never shows either love or hate, hes just interest in what Keng does.

The scene when Tong walks to the darkness is like the transformation of him into the monster again. Later whe see a scene where Tong is in the camp and then he goes. After this Keng arrives and then a cow dissapears.
This explains also why Keng finally surrenders to the monster. He wants to be with him and he just offers himself.

I know this explanation is a little wack but I thing it fixes. What do you think?