Daniel crying reminded me a little of how Desmond felt when he appeared to go back in time after the hatch implosion. He was reliving a portion of his life, he was confused as to what was or wasn't reality and it was emotional. It seemed as though the crash site was an emotional trigger for something buried in Daniel's memory. Something he suppressed or was erased by another party....?

I do not believe the boy in the picture is Eko. He seems to be in the same age range and that is about it. I looked at closeups of both pics this morning. Eko's bone structure is larger and the faces are different. However, if you were not close up it might be easy to mistake one for the other.