Turns out Caleb, of all people, is the reason Zach is staying. He convinced Derrick who convinced everyone else.
Derrick's pepper spray>>Dan's mist
Not quite sure about that.
I need to go and watch After Dark from the beginning but, when they were talking about Caleb...it seemed like they were making fun of him for being so far out of the loop that he actually believes he's the one responsible for Zach staying.
Basically, saying that Caleb has no clue about the discussions and decisions that are being made behind the scenes since he's never a part of those conversations.
They only tell him what they want him to know to keep him in line.