Indeed, Mu Houchu possesses the ability to depose the current Emperor, but it's definitely not the right time now. The change of dynasty is a major national event, how could an outsider easily usurp the throne? Even in his previous life, it took Mu Houchu six years to ascend to the imperial throne.
And six years before now, in spite of his enormous power, he couldn't surpass the imperial authority. A person dreaded and determined to be removed by the Emperor would hardly be able to escape.
It was the same case with the Song Family; how could Mu Houchu not understand this simple principle today?
When Mu Houchu was once dreaded by the emperor, didn't he also voluntarily give up power and stay far away from the capital city? Persisting with arrogance would only lead to a tragic death. When it's time to concede, one must step back; when it's time to prepare for the worst, one must not become negligent.