Oh!!! That makes sense. I don't get into that segment of the game since it just seems like too much work. I just like having great characters on my team for flexibility...and some of them look cool. I mean, I got Tilith finally, but after leveling her up, I have no idea how to use her, so I've been sticking with Y'shtola. I've never really figured out how to chain attacks, so I always just select units from the lowest attack to the highest. Always ending with the character who has the highest ATK value.
Not sure how to do more than that, which I guess I can't see why people don't like Lightning. I use her for every event since she's generally the best unit for clearing out the waves before the boss in Mog King events. I tried other characters, but she always works best for that.