This theory suggests that Kid and Law will become Loki's subordinates, forming his "wings" in the final war against Imu, based on their recent losses, proximity to Elbaph, and how their personalities and powers could rival Zoro and Sanji.
The big Ussop moment coming up in Elbaf will be him standing up to Imu to protect and motivate Luffy when he is defeated on the ground, similar to Enies Lobby. But this time he will be right in front of the villain, not at a safe distance. Ussop will then develop future sight, seeing his own death, but deciding not to back down and dying a brave warrior of the sea. But before he dies, it turns out that Luffy had the same vision of the future and managed to get up and drive Imu away with a final attack, similar to jet gatling.
