This is what we call the 'coop', where they should have roosts to sleep on and nests to lay in.
It much too small for 6 birds.
Where are these "nests"?
She a little nuts, but had some solid advice....
....up to the magic juice part.
Isolating the bully might work...but is a last resort. IMO.
Sounds like typical integration behavior to me.
How big is your coop and run, in feet by feet??
Dimensions and pics would help here.
Here's some tips...