Written by Agnes Chang, Vivian Wang, Isabelle Qian and Ang Li It was the lone disruption in one of the most closely choreographed events in China: The country’s former top leader, Hu Jintao, was suddenly led out of the closing ceremony of the Chinese Communist Party’s twice-a-decade congress. The congress, where China’s next leaders are anointed, is the single most important political event for a ruling party fixated on control. Every detail, whether it is the outcome of its elections or how servers pour tea, is planned. Nothing unscripted happens. Nothing unscripted is allowed to happen. Except this year, it...