i think you mixed the names of Lee Jordan and Dean Thomas here
if sanji is op with observation haki i cant imagine how op Brook would be with observation haki, he problably will use it just to see panties i think
the best weapon with haki the sandals
why the chapter title has billie, but she dont appear in the chapter ???
he could try creatina a tecnique like the one from douluo dalu 2 that Huo Yuhao learn from Mu Lao called Absolute Dominance Sovereign's Descent (Absolute Dominance) It is an ability created by his teacher Mu Lao. It is a perfect fusion of physical and spiritual attacks. Huo Yuhao can unleash it with his fist, or fuse it into weapons. It is said that once his opponent took a hit from Supreme Reign, their confidence would seemingly be crushed as well, his opponent would develop a fear of him, and there were no way they could resist him the next time they encountered each other.
use it to copy the amulet
komeko is her Sister! i think you mean chomusuke