Destiny Questions #6 - Any questions?

Is the Speaker the first Guardian? As in, the first person the Traveler ever revived? He must have been a Guardian at some point, since he has a Ghost. Are the Traveler and the Darkness sentient singularities, a la Peter F. Hamilton's [i]Night's Dawn[/i] series? Is Rasputin the source of the Vex? Did he perhaps [i]become[/i] the Vex, in a far-future time, then seek to insinuate himself/itself into an earlier timespace coordinate set? Why do the Hive only interact with the Fallen, when all other enemy races fight on at least two fronts? Is the Black Garden located inside the Traveler? (Note that it needn't be actually physically inside it, but more connected to it - think TARDIS interior vs exterior.) What was the black amorphous thing in the Black Garden, and what gives us reason to believe we actually hurt or killed it? All the fireworks could just as easily have been a diversion to let it leave, and this thing is supposed to be a god after all. Killing three of its minions is supposed to kill it? (Don't let YHVH know, he's only got two left.) Any information (over and above the Grimoire) on the Cabal? The in-game story makes them out to be these titanic, constantly-annoyed badasses, then you actually fight them and roll over them like speedbumps. Thanks!