Who is the strongest among the four Grandmasters?

According to the settings of " Celebrating Years " and the analysis of various materials, the Four Great Grandmasters of the year were the Qing Emperor and Ye Liuyun of the Qing Kingdom, Ku He of Northern Qi, and Sigu Jian of Dongyi. The four of them were all very powerful, but if they were to choose the strongest one, the Qing Emperor might be the choice of many. The Qing Emperor's strength was the strongest among the four Great Grandmasters. Not only did he have endless internal energy, but in the battle of Dong Mountain, he could easily deal with Ku He and Sigu Jian's attacks. He had even crippled three Great Grandmasters. Although he had lost half of his Tyrannical zhenqi, his strength was still unmatched. In addition, the Qing Emperor's identity also gave him a great advantage. As the emperor, he had great power and resources. He could mobilize all the experts in the world to work for him. Moreover, he hid the fact that he was a martial grandmaster, catching the enemy off guard. Of course, the strength of the other three grandmasters could not be underestimated. Sigu Jian's swordsmanship was incomparably sharp. Ye Liuyun's Flowing Cloud Release shook the world. Ku He's position as the Imperial Advisor also gave him immense power and resources. Each of them had their own strengths, but if they had to choose the strongest, the Qing Emperor would probably be the choice of most people.