Indeed, the fact that we do see the Pandoran equivalent to primates and they have six limbs and four eyes is very suspicious indeed.
Yeah, but did you notice how the arms were attached to the trunk with a single upper-arm? There's part of your missing link right there. As the mammals have evolved, they ended up with two arms instead of four. That "Pandora Monkey" is the middle step, with two arms on each side that join up part-way.