Qi Peijia
Even as a Grade SS individual, Kasuyi still seems to be weaker than the WTC's Tree Kings according to the enemy's analysis. At this benchmark, maybe only Wuornos and Han Xiao are their equals. Since the WTC has a higher number of top-level fighters, it'll come down to quantitative measures to overcome this hurdle. Oathkeeper needs to revive more Beyond Grade As asap.