I'm not even sure if they're going along with the original story. That is to say, in the original story, the Traveller did seem to have an ulterior motive, but this, along with other things were cut. However, it would seem that stuff from the grimoire stayed in tact, so at this point only time will tell what Bungie will do with the direction of the story.
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That's a lot of words that come together to mean "we don't know right now" lol