I. Song Renzong and Zhang Guifei
The most famous thing in Song Renzong is the exchange of civet cats for princes. His biological mother was that shortly after his birth, he was "changed" by the queen Liu E and was taken care of by her confidant Yang.
As it happens, one of Yang's relatives died, leaving a little girl orphaned. Although there was an uncle named Zhang Yaozuo, that was "Yaozuo left without receiving his shirt". So the little girl was arranged to take care of Yang in the palace. This little girl is the future Zhang Guifei.
It is obvious from this record that the emotional foundation of Song Renzong and Zhang Guifei is stronger than that of other concubines. Therefore, when Zhang Guifei grows up, she can be amazing in Song Huizong and become a concubine. Although Song Renzong people are generous, they also prefer women.
And Zhang Guifei understood this truth very well. Later, she adopted a little girl and became Song Renzong's concubine when she grew up. This is Zhou Guifei! (Zhou Guifei, from Kaifeng. She was born at the age of four and entered the palace from her aunt's house. Zhang Guifei is a daughter. A little longer, so I served Injong and gave birth to two princesses.
To sum up: the two have a good emotional foundation and have had similar experiences, so they can understand each other. On this basis, Zhang Guifei better understood Song Renzong's "needs". How could Song Renzong not love Zhang Guifei? Since Zhang Guifei has no background, he naturally maintained his relationship with Song Renzong wholeheartedly and made Song Renzong his patron.
Second, Song Renzong and yellow grass.
Empress Cao has a background. Her grandfather was Cao Bin, the founding star of the Northern Song Dynasty! Belong to a big family, knowledgeable, dignified and generous, and Zhang Guifei obviously belongs to two kinds of people.
Cao Niangniang can become a queen because she abolished the powerful Guo Niangniang. The marriage with Queen Cao actually belongs to that kind of political marriage. Although empress Cao is virtuous, she obviously prefers to run every day. Because you can relax.
Queen Cao also has a big shortcoming, that is, she has no children! So this is caused by the fact that Empress Cao dare not be tough! Because the powerful queen Guo is a lesson from the past, and she has no children herself, she naturally turns a blind eye to the right love.
To sum up: I have a bad emotional foundation with Queen Cao and belong to a political marriage. And dare not and can't be tough, so Cao is more of a "symbolic" function. But for Song Renzong's emotional needs, it can only belong to a subordinate position. In this case, Cao Can only tried his best to keep the throne. More clearly, Song Renzong and Zhang Guifei are actually more like a couple.
3. General comment: After the analysis of these two aspects, the answer has actually come out: Song Renzong really loves Zhang Guifei! Therefore, after death, Cao can only make her queen. If you dare to stop her at this time, it is estimated that she will be abolished!