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Ghost Recon Wildlands used a similar mechanic in their core game. You could choose whether to leave your game open to friends as you played or switch to "invite only". If a friend did choose to join your "friends only" session, your AI team would disappear and your friend would spawn nearby. ....and vice versa. The change was absolutely seamless for the session owner and worked very well. The downside was if you right in the middle of a mission where you may have been depending on that AI but that was usually overcome rather quickly. Besides, you always had the option to turn off the feature if you're in such a situation and rather not be disturbed. My main point is that the mechanic works and there are things that can be tweaked easily enough to help prevent some of the issues folks here have brought up. When friends joined, they saw the same cutscenes, etc. in the story as the main character (just as you would if you were playing it yourself). It worked quite well and I would love to be able to play co-op in the RDR2 main campaign.