I have 4 greys. Two females and two males. I do not let them interact physically. They have their own cages, playstands and time with me. Two (Emma-f and Sydney-m) can eat dinner near eachother, though, Emma will often take food from Sydney's foot or beak, because she can. (Must be better if he has it) But when they are in the mood near their cages, the can either get along or stalk eachtother to pull tail feathers. Emma seems to be the instigator.
Sydney does not tolerate Stirling(m) in the least bit. Sydney's entire life revolves around how he is going to "get to" Stirling.
Sydney does not bother Abby(f) at all.
So flock dynamics around here as as follows:
Sydney is friendly with Emma and Abby and is out to get Stirling.
Emma is friendly with Sydney, Abby and Stirling.
Abby is friendly with Emma, Sydney and Stirling.
Stirling is interested in Emma and Abby but knows to stay clear of Sydney.
So I know how my flock reacts to eachother. I would still never leave any of them unattended for a second because like children poking and teasing when mom and dad are not looking, I do not know if anything will escalate.
With that said, they do act like a flock and communicate to eachother continuously, so they are bonded as a flock.
International Association of Animal Behavior Consultants-
Associate Certified Parrot Behavior Consultant #729