Regarding whether to execute Duke Zhi Wei, there was major internal dissent within the Suo Lun Group.
Apart from Zhen Yan Princess, nearly everyone opposed the execution of Zhi Wei, because his status was too lofty and the royal bloodline was already so thin. Killing another one, even if Duke Zhi Ting and Zhi Wei were at odds, would leave everyone feeling anxious and uneasy.
Not only that, the reason why King Zhi Bian's relationship with the various nobles of the world was so stiff, and his reputation not so good, was because the battle for succession had been too bloody, with three of the six princes dead.
Now, Suo Lun's execution of Zhi Wei would readily bring those memories back to people's minds.
Many would wonder, Zhi Wei survived the battle for the throne back then, only to end up dying by Suo Lun's sword.