1) The Mother alone could not have destroyed the well and killed off the entire group of men by herself, especially not in a few hours. She likely either summoned The Smoke Monster in the same way that Ben did, or is actually The Smoke Monster, herself. I'm going to assume the former. The Smoke Monster was also interested in setting up The Man In Black to fail in his quest to leave The Island in order to incite his rage, which leads to him killing the false mother and being tossed into The Light by Jacob.
2) Claudia appears to The Boy in Black. This could have been evidence that he had a similar power to Hurley, but I feel that Claudia was The Smoke Monster appearing to The Boy in Black, attempting to sway him toward "The Dark Side".
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