Yeah... that's the thing most folks don't think about.
Any time you ad or subtract a bird, the flock dynamic changes. One bird can disrupt the apple cart. I've seen it happen and I've had it happen... Just one more, can be one too many.
You want to get "your bird" a friend? What if he doesn't want a friend?! What if the friend turns out to be a third wheel... taking what little attention he still gets from you away from him? What happens then...?! That's right, they are gonna argue... and someone's going to lose that argument. (Usually the little bird.)
OR one bird can hold the flock together. SALLY has always been the flock leader of this flock. Even Maggie deferred to her... and if Maggie did, you'd best be sure the others followed her lead...
And Maggie was the goofball that initiated all the games around here. When she was here, it was always playtime. If you don't come to us, we'll come to you...
My flock had "rules" that the birds themselves enforced. That's one of the reasons I could take on "behaviorally challenged" birds, is because MY ENTIRE FLOCK would mass on them, and keep them in line if they acted up... IT WASN'T JUST ME.
Like with Demitre... NOTHING I did cured his screaming... BUT Sally put a PERMANENT stop to it in one night.... Still one of the most amazing things I've ever seen one bird do with another.
That dynamic is very real, and if you watch the wild flocks, you'll see it in action as well.