I wanna add something,
Just like Kaidou had Caesar, Imu had Vegapunk
And when SHs reached Punk Hazard, it was revealed that Caesar is responsible for Two Experiments, Smile Army & Giant Kids
Smile Army was created for Kaidou & it's basically an Army of Beasts while Kaidou is Strongest Beast
Giant Kids on other hand was Caesar's Side-Experiment (Not for Kaidou) & They clearly resemble Big Mom who ended up as 2nd Wano Villain
Conveniently, when SHs reached Egghead, it turned out that Vega also have Two Major Experiments, Pacifista Program & Satellites
Pacifista Army were created for Gorosei/Imu, so just like Smile Army, Pacifista/Seraphim have Powers that resemble Main Villain's Powers
Common thing between All Pacifista Models (Including Seraphim) are Light-Based Powers
Meaning Imu is Strongest Light User, which explains Room of Flowers, Lulusia Destruction, why Oda made Kizaru & Ryo have Justice that makes them obey CDs, Light focused on Second Straw Hat ... etc
And just like Wano had a Secondary Villain (Big Mom) who resemble those Giant Kids, Mary Geoise also have a Secondary Villain who resembles Vega's Second Experiment which is making Copies of One Self who share same Intellect
In other words, Imu is Main Villain of Mary Geoise Arc & has Divine Light Powers, while Secondary Main Villain is a Knight who can create others with similar Skills but They look differently, which means these Nine Holy Knights are basically Satellites of their Boss & 10th Knight
(Changed my mind, it's not Imu, it's Secondary Main Villain instead)