The reason a trump card is a trump card is because, before it is used, outsiders can't guess what it is.
The things Zhouyang left for Zhou Guangxiang, aside from the two of them, were unknown even to Zhou Guangxiang and Zhou Xuanhao.
This was not due to distrust of these two, but for confidentiality purposes.
Especially those two Puppet Flying Eagles, which were once possessions of Xiao Bufan, a Purple Mansion Cultivator of the Yellow Sand Sect. Zhouyang had landed in danger because of these items.
When he handed them over to Zhou Guangxiang, he clearly instructed that unless absolutely necessary, he mustn't use this trump card.
One must know, Xiao Bufan was a disciple of Cao Wenjin, junior of Jiang Yuyan, and senior of Zhang Yunpeng.
If these things were exposed, emotionally and logically, they would be reclaimed by the Yellow Sand Sect on behalf of Jiang Yuyan and his spouse, directly exposing how Zhouyang obtained the Blood Nether Storage Ring.
