Yu Wenzhou wasn't certain. As one of Glory's four Master Tacticians, there was no way he wouldn't recognize a common tactic when he saw one. It was just that Zhou Zekai's focus towards Qiao Yifan didn't seem to fit the goals of a BOX-1.
The purpose of a BOX-1 was to shut out the opposing team's most important player. Everyone recognized Qiao Yifan's capabilities. Demeter's advantageous opening had required his Darkness Boundary. Ye Xiu separating Jiang Botao from the rest of Samsara had been thanks to Qiao Yifan's interference towards Zhou Zekai. He had been a crucial component in Demeter's plans.
But was Qiao Yifan's importance to Demeter greater than Zhou Zekai's importance to Samsara?