Xie Lian continued, "I dare to speculate that the person named He Sheng only has the character 'Xuan' in his name. Furthermore, his birth date and time share the same heavenly cycles as Lord Wind Master."
In the game of deceiving heaven and earth, one cannot simply choose anyone. Certain specific qualities must align perfectly.
From the three questions the White-Talking True Immortal asked when it first captured Shi Qingxuan, it clearly remembered two things: first, there is a 'Xuan' in its prey's name; second, it knows the prey's birth date and time. However, it does not recognize the prey's face; Shi Qingxuan must walk up and show himself. Because the Shi family had acted quickly to remedy the situation, they likely knew nothing more than that.
Thus, to find someone to take on Shi Qingxuan's calamity, it must be a man born at the same time, on the same date, and who carries the character 'Xuan' in his name.