LOST Theories (will have spoliers)

[Jon Kano]

Originally Posted by wwe2222 ?? So this is the first time they have seen each other in 2,000 years? It doesnt make any sense. Im going to assume MiB cant leave the Island because he suffered a fate worse than death, where he is ultimately trapped as this smoke monster. Did going into the glowing cave release some sort of ancient evil and thats why Jacob is there? The mother made it seem like they were there to protect the energy source while Jacob says he is there to keep the smoke monster from leaving. So which is it?

Yeah here is my current take....

The white light that Mother said needed to be protected is 'the heart of the Island' and what it is, is something that is inside every man - I think it takes the right man or right person to 'have it' or guard it in this case. If the wrong type of soul claims it, the power becomes darkness and evil. Mother thought MIB was special, in a good way. He is the 'Bad Twin' of the two.