I think the difference between Kristen and the rest of them is the drama that Kristen creates for Lisa. Stassi and Scheena will talk to Lisa about what is going on. Lisa will approach Tom and Jax to give her two cents in what they are doing, and to discuss what everyone else is doing with Peter. Kristen is the only one who sets ultimatums. She's the one who will refuse to work certain assignments because of the people around, will try to tell Lisa how to staff, etc. They others create drama while they are working. Kristen creates drama in lieu of working.