There are a lot of good ideas that Grand Theft Auto 6 could pick up by taking inspiration from one of Grand Theft Auto Online's mission types. Considering how much content is in GTA Online, it feels inevitable that at least some aspects from it will be recycled into Grand Theft Auto 6. Some of the best ideas came in the form of the game's various missions, which have only grown as more expansions have come out for the game. One specific branch of missions would not only work, it could easily fit into the game's story.