How Xi Jinping obtained absolute power through Party Constitution and the CCP princelings

Chinese leader Xi Jinping is modifying the Party Constitution again and is more than likely to secure his third term at the 20th Party Congress. His rise to the top seemed accidental as he was the compromise of a power struggle between his two predecessors. After 10 years, however, Xi has transformed into the most powerful Chinese dictator since Mao Zedong. Have people underestimated Xi’s ambition? How did Xi become Mao II?