Wang Xianzhi
In 877, while the campaigns against Wang Xianzhi and Huang continued, Wang Duo and fellow chancellor Lu Xi had a major disagreement with Zheng about the command structure of the imperial army sent against Wang Xianzhi and Huang—as Wang Duo and Lu wanted to put the imperial guard general Zhang Zimian () under the command of Song Wei (), but Zheng believed that, due to the rivalry between Zhang and Song, if Zhang fell under Song's command, Song would find an excuse to kill him, and therefore refused to concur in Wang Duo's and Lu's recommendation. This disagreement escalated such that Wang Duo and Lu offered to resign and Zheng offered to retire. Emperor Xizong did not approve any of these offers.