All joking aside, I think that the best format for a prequel Cassian Andor show would be an episodic one. Each episode being mostly self-contained focusing on the missions that made him into the person we meet in Rogue One. Each episode would have different characters for him to interact with, different worlds to see, different tie ins. Some missions would be successes, others not so much. One could be the story of how he found K2. Another could be about how he gets his promotions. There could be an overarching baddie and story line (like Cowboy Bebop – that’s honestly the best comparison to me because Cassian’s story seems like it could fit well into the melancholy, space western genre) but I think at this point, that might be a better avenue for a new star wars venture.