Yep, some say to separate...I say Cull...
This time out thing. How does a chicken associate unacceptable behavior in the flock with being separated as a form of discipline. Really. I chuckle every time I read it. Chickens do have brain cells but I doubt they have the ability of causal /effect thinking especially when the immediate behavior before being given a time out is being chased around the run or coop by the owner.
I have had livestock animals all my life and have just recently started keeping chickens. From my experiences certain chicks hatch aggressive, nearly cannibals favoring the flesh of the other chicks. Imo it is a genetic thing. A throwback to the days of jungle fowl when this type of behavior was actually a benefit to survival but not in the domestic flock.

