Mmmmmmmm Im still not convinced that Jacob is the good guy in all this.
He has been portayed with Christ characteristics and such for the reasons of misdirection, I believe.
Both Jacob and Smokey seem intent on using everyone else to play their game and damn the consequences for everyone else.
What if they aren't a God/Devil kinda deal, but two halves of a Light/Dark hybrid...?
"Two sides....Light and dark" why not light and dark at the same time...?
So really Locke could still be "one of the Good guys" in this grey dominated landscape of usual blacks and whites that is LOST.