Though you have to admit that the fact that Rasputin shot the Traveler would explain why he's got a cold shoulder for the Guardians, having a "light" signal and whatnot. As for the Darkness, I think the reason of the collapse and the Darkness a two different things. According to the BoS, the collapse, syzygy, god-wave, whirlwind or whatever was coming no matter what. So, IMHO, I think we are in a Babylon 5 War of Shadows type of war. Meaning two different ancient races and philosphies being fought out with us either between or unwittingly used as pawns in it.