C2C helped out in the composting department. If you've noticed, a lot of extra effects and anti-aliasing effects are very similar to C2C shows. Also, ACTAS and BamCo are subsidiaries of Studio Sunrise. The director, Tatsuya Yoshihara is the reason why Black Clover's production didn't implode. The first episode has his fingerprints all over it. As a sakuga fan, it's easy to notice his style of animation and storyboarding. The smears, the wind effect, the absurd level of character animation, it's all there. Even if another animator key animated the scenes, Yoshihara's corrections are far too prominent to not notice. Also, if you're going through the staff, I highly recommend checking who the main storyboard artist and director of photography are. Both are VERY important.
