I have listed 2 items that I believe can not be emulated simply because they are non-quantifiable. Even if you modeled every neuron in the human brain, I still don't think you could create human level of intelligence simply because the interactions are too complex and that's just neurons. We still don't know what astrocytes and oligodendrites contribute and they outnumber the neurons 10 to 1. I also agree with you that an AI is not required for the singularity. Cloud sourcing maybe the beginning of the singularity as we integrate human abilities with computer architecture.