For men to become embroiled in an argument that one mechanism exists and the other doesn't, is truly missing the point.
Actually, you're missing the point, which is: why would God need to employ two different mechanisms of awareness,
I think this question would necessarily need to be aswered to justify your position.
Clearly, man is unique in God's creation, and his uniqueness is inextricably connected to his awareness and intelligence.
If, somewhere along the line of evolution, God were to imbue a primate, or primates, with a soul, then their awareness and intellignece would necessarily need to be altered profoundly, otherwise, what is the point. Such a condition would be indistinguishable from the evolutionary process which would take us there eventually anyway. There simply would be no further need for God to interfere in a system that would acheive the same results.
That said, we certainly see no evidence of a profound shift in behavior as can be extrapolated from the fossil record, and to suggest that God imbued whatever organism or existent (that evolution suggests is the common ancestor of all animal life an earth) with a soul, would simply be an absurdity.