Dark Chocolate

Brooke said that we have to choose if we want to keep dark chocolate in our protocol or not. But it contains sugar. So what is the difference between dark chocolate and other sugar?

If I keep it in my protocol, does it change something if I eat it just after meal (to be digested with the meal) of alone at another moment of the day?

If I eat a piece of dark chocolate after meal, won’t I higher my insulin level?
Thank you