I think it will go the opposite way. MSQ is only dealing with the Thirteenth during 6.X and then after that we get a sidequest where we help Zero connect with Cyella and Unukalhai (and probably also Ryne and Gaia) and they go off on a void-repairing sidequest tangent together.
If, as people are guessing, the "big change" for 7.0 is the establishing of travel between shards, or at least the First, it might not even be a major effort to get those characters together.
