They (specifically Carlton Cuse and Damon Lindelof) never actually said everything would be explained, in fact, they often stated the opposite. So, not sure what you mean there.
Atmosfear, the writers gave the Man In Black a name. Samuel. They even wrote it into the script but left it out as they felt it was unnecessary to explain. They also heard you complaining and really enjoyed it.
I like that the bomb never really changed things. And it was the island timeline that truly mattered.
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