If you get the Lucien Lachance summoning spell as a bonus in the Skyrim dark brotherhood quest line he says something interesting when you’re looking for Cicero in the Dawnstar sanctuary. “I will kill this jester if you so desire, but there is a disturbance in the Void. Our Dread Father does not wish this.” I usually kill Cicero but i decided to let him live on my most recent play through, because of what Lucien said I realized Cicero was kinda right. Astrid did betray us and Cicero knew he didn’t like her, he just didn’t know why.