Princess Taiping, finding Li Longji difficult to control, began considering trying to replace him as crown prince with one of two nephews with arguable better claims than Li Longji—Li Longji's older brother Li Chengqi the Prince of Song and his cousin Li Shouli the Prince of Bin, the son of Emperor Zhongzong's older brother Li Xián (note different tone), who had been crown prince at one point during Emperor Gaozong's reign.
He soon frequently clashed with his aunt Princess Taiping, however, on matters of politics, and Princess Taiping tried to spread the sentiment that Li Longji should not be crown prince, and that his older brother Li Chengqi the Prince of Song, who was born of Empress Liu, or his cousin Li Shouli the Prince of Yong (the son of Emperor Ruizong's older brother Li Xian (note different character than Emperor Zhongzong)) should be crown prince.
Early in the Kaiyuan (713-741) era of Li Shouli's cousin Emperor Xuanzong, Li Chenghong was created the Prince of Guangwu, and he did not succeed to the greater title of Prince of Bin upon his father's death in 741, suggesting that he was not born of Li Shouli's wife.