Also, when the world was divided into three parts, our country could still be attacked at any time at that time. If Sun Ce, the eldest brother, should be awarded the throne by Sun Ce's son, then someone will surely say that Sun Quan should not be emperor. When the country was just founded, the most taboo was that the monarch and his subjects were not United. Not only can there be war outside the country at any time, but if there is chaos inside, it will definitely put the country in danger.
In addition, if Sun Ce, the eldest brother, is posthumously sealed, there will definitely be someone who wants Sun Ce's son to be emperor among the generals led by Sun Ce. Zhou Yu is a man who fought with Sun Ce. At that time, Sun Quan became emperor, called Zhou Yu back urgently, and then said to Zhou Yu. I am an inexperienced person. You'd better be emperor, Zhou Yu. This is also a test of whether Zhou Yu supports being an emperor, and Zhou Yu understands it, but Zhou Yu did not say that he wanted to be an emperor. Of course, Zhou Yu promised to die at that time.
To sum up, for various reasons, it is absolutely reasonable for Sun Quan not to pursue his brother Sun Ce, which is what this country needs.