>>280354569
The only one that needed an explanation was Shirahoshi, and even then Shirahoshi is a living weapon so it makes perfect sense why Imu would be focused in her.
Blackbeard and Luffy are both front runners to become king of the pirates, Luffy was seen as a danger by the world government even before he became a yonko, and Blackbeard had his show at marineford.
Really, the biggest question I have is why Imu is so fixated on Vivi