However...

However, when we consider carefully his other motives, we will understand that the sweet dream (i.e., supreme authority) is the greatest of them all. The following occasions indicate some of the motives that urged Mu'awiya to make peace with al-Hasan, peace be on him: Mu'awiya thought that al-Hasan, peace be on him, had the right to assume power.

So the former had no way to take the reins of government but through making al-Hasan keep silent even if apparently, and he had no way to make him keep silent but…