I'd be kinda disappointed if the story was being narrated like a Christmas special, but anyway, the kind of questions you're asking are maybe paranoid but also not answered in the concrete terms that you want. From here, we can only say "we'll see".

Sure. Until more is revealed all we know can be summed up as: Oryx has been chasing the traveler for some time. The travelers origins and motives are unclear The traveler hasnt stayed to defend a civilization it altered. They've all been destroyed or altered. When something arrived in our system after the golden age, Rasputin detected activity in the traveler, assessed it as getting ready to depart, and hamstrung it to force it to stay and protect him/humanity. This is what we know from a variety of the cards, and without relying too heavily on any one card since it's pretty obvious nearly everyone has their own personal agenda in the grimoire. I.e. The traveler may or may not have been preparing to defend humanity. Rasputin may or may not have been attempting to defend humanity or himself. Oryx was just trying to get revenge, save his(her) race, and help the universe progress in its intended manner. The Awoken and Eris are having various dealings with each other and with other non-vanguard sanctioned fellows. Varik's may or may not be plotting to reunite the fallen under a kell of his choosing for either benign or malign ends. Ect Ect. I think ultimately the story originally rejected was one linear story that was very black and white, but the story since has evolved to take on many shades of grey. I personally would find it interesting if the alpha lupi sequence is a third party setting the stage of the opening act for a bigger production. Regardless of the Traveler's motives, he's dependent upon us now. And how do the worms and the vex fit into all of this? It's pretty clear that the fallen and cabal are merely societies impacted by the traveler and oryx, but even the vex and hive seem to be pawns at play in a larger game. The one thing that makes me think the story isn't a straightforward as it appears is how much play the vex are getting in TTK. Especially their ability to simulate realities, reach conclusions, and then set things on the path of those conclusions. TL:DR you're right, we will see. But I'm guessing the traveler isn't 100% benevolent creator. And that the light of humanity, and subsequent success, wasn't an event planned by anyone attempting to work the levers behind the scenes.