Well if anyone watched the re-airing of the pilot episode today, about 4-5 times throughout the episode, the pop-ups said that the smoke monster was MIB. I know I've argued about the validity of the pop-ups, but when something is reapeated that many times, I think they mean what they say. The smoke monster is MIB.
Just like smokey = MIB TPTB also stated MIB = Locke..to them...even though they are different personas/characters....they are still the same antagonist...if we can safely call him the antagonist...=)
Hold on a sec, Tex. Let's not compare apples or oranges here.
If TPTB said MIB=Locke, it was before the big reveal at the season finale that made our brains explode. In fact, I don't think they
ever said MIB was Locke. They likely only called the Ajira Locke, "Locke".
On the other hand, they have already shown the backstory of MIB. Unless there is going to be a major 180 after what they just showed us a couple episodes ago, I really don't think you can compare the 2.