Originally Posted by
Paro
I believe the events on the island symbolically represent a game of chess between two sides: dark and light, black and white, evil and good. The game is played between two stances, who use their pieces to prove their stance. One side believes in the cooperative nature of humanity, while another believes in the destructive nature of humanity.
After tonight's episode, these two sides have been clearly illustrated...
On the Light side belongs Jacob as the leader, who uses his pieces and arranges them to prove his point: Humanity has a chance to avoid destruction, since everything before destruction "is progress".
Jacob's pieces include: Richard, Ilana, Bram and the other "shadow of the statue crew", and probably the majority of the Losties.
The leader on the Dark side is the unnamed guy at the beginning of the finale episode, in the black shirt, speaking to Jacob, in the white shirt; I would also go as far as to say this man is the Smoke Monster. He is the guardian of the underworld (of sorts), and does not seem capable of directly interfering with human affairs; instead, he manifests himself through various dead characters, and uses influence to change the course of events.
Dead character's he has manifested himself as: Christian, Alex and Locke DEFINITELY. (Perhaps Yemi). He has also, most recently, influenced Ben.
I feel this is definitely evidenced. At the beginning of the episode, the man in black told Jacob he would find a loophole and kill Jacob, who then responded by pretty much saying, "You know where to find me."
... Centuries later, the man in black animates himself as John Locke, which instills a sense of faith in Ben once again. Ben seeks judgment from the Smoke Monster. Once in the Cavern, Ben falls through the floor, and Locke leaves to find help. Coincidentally, the Smoke Monster appears, and judges Ben. Once the Monster disappears, he animates himself as Alex, who tells him to follow everything John Locke (the man in black/the Smoke Monster/Reanimated Alex) says. This obviously sets Ben up once again, when he is faced with the the choice to listen to Locke, or leave. Having been threatened by the Smoke Monster, and being what felt like betrayed by Jacob, Ben stabs him.
Although Ben is being used, I still contend he will turn out to be on the right side at the end of it all.
All these characters are pawns, rooks and bishops in a large game of chess being played on (and off) the island; this "game" is indicative of the ultimate nature of humankind, and the Valenzetti Equation is suggestive that the dark side wins so far. Inevitably, the good side will overcome the odds, and change the numbers before the end of the series.