Working backward from the outcome.
Xu Cheng could have figured out with his feet that Tang San was behind this.
Only after Zhou Weiqing had exhausted his fortune, lost his wife and children, and been left utterly alone did he happen to meet the God of Destruction?
And since Tang San had promised him a divine seat earlier, given how exceptional Zhou Weiqing was, Xu Cheng refused to believe Tang San had not been keeping an eye on him. Yet judging by what happened afterward-once Destruction held the overwhelming advantage, Zhou Weiqing "accidentally" learned that the man on the opposing side was Tang San, his former benefactor, and then switched sides mid-battle, dealing Destruction a fatal blow.
Wasn't that a little too convenient?
Xu Cheng could not help wondering whether Zhou Weiqing was a hidden piece Tang San had planted within Destruction's camp, ready to catch Destruction off guard when the moment came.
Of course, Tang San could be set aside for now.
But honestly, Xu Cheng did not think much of Zhou Weiqing either.
Destruction had treated him well and had never wronged him, yet his reason for switching sides mid-battle was simply that Tang San had done him an even greater favor before that... so?
So that was his excuse for being a scoundrel and turning traitor at the last moment?
Ultimately, the conflict between Destruction and Tang San was a clash of opinions. Neither side was inherently right or wrong; at least in name, both were acting for the Divine Realm's sake.
Zhou Weiqing's supposed justification that he had switched sides because he believed Tang San was right did not hold water at all.
What, could you foresee the future like God King Tang?
*Since you couldn't, after Destruction's faction had helped you so much, you switched