Yeah, so far this is what we're doing. I was hoping to run the quests to freshen up the story line since the last time I was on was 2017. But I manage by just watching the dialogue in his orbiter on his screen lol.

No, he had the quest on his and I had it queued up on mine, but after the quest it advanced on his end and not on mine. I figure it's because mine was a rerun, and his was first time. He was running as host.

At this point I'm going to assume the quest lines don't advance when they're reruns >< I guess my partner and I can experiment more based on who selects the mission to vote and such as well...

Still looking for answers!

Well, fingers crossed that when we hit non-solo stuff that I haven't touched yet, there will start to be progression. It would be a pain to run through everything twice.