Board Thread:Questions and Answers Forum/@comment-216.80.140.168-20141007023332/@comment-25483408-20141029171150

"The Guardians were being tricked into finding the components necessary to revive the Traveler so that it could finish the job. The rest of the plot would be the players siding with renegade Guardians to prevent the Traveler's revival. "

Yup, as evidenced by the whole "stranger" character.