Why didn't Song Gaozong recover the Central Plains and welcome back the Emperor Qin?

Isn't the change of seizing the door in Ming Dynasty an obvious example? Once Huizong and Qinzong were welcomed back, it would inevitably force Gaozong to abdicate. What Qin Zong said was just a plan to slow down the troops, in order to let Gao Zong save himself. Once you return to the Song Dynasty, you will definitely think about the restoration. To take 10,000 steps back, Qin Zong is unwilling, and there must be ministers in the DPRK to take this opportunity to make great achievements. At that time, the emperor's position will be unstable. For the sake of his own throne, Emperor Gaozong would never welcome the second emperor back. There was a mutiny during the reign of Emperor Gaozong. Emperor Gaozong was forced to abdicate and give way to the young prince. Later, he was reinstated and forced to die. The emperor has become a frightened bird and won't take any more risks. As for Qiao Guifei, Zhou Ji and the emperor's mother, they just pretend to be friends with them so as not to make too many enemies, but actually hate them. Now that her son is emperor, it is a good time for revenge.