Well...
That didn't go as planned.
My thought was that I would move the pullets first, give them the upper hand on things because I know that Myrtle specifically can be pretty wicked. Then I would move Gus, let him figure things out with the pullets and let them schmooze so that Gussy would maybe offer some protection from Myrtle once she came along. Then lastly, Myrtle and Zinnia would go out and I'd let them figure out their new pecking order with Gus to intervene if the fighting got too bad.
How it
actually went is like this. I moved the pullets first as planned. They were confused, but seemed okay, and Freia back at the coop seems okay. Then I brought Gus out there. Athena and Ottilie immediately were like, okay, this is a rooster, we're cool with that. Inara and Boba were downright offended that Gus existed. Immediately, they were in a knock-down-drag-out, kicking and flapping and grabbing onto each other's combs. I grabbed Boba so that Gus would not be outnumbered. Too late, he was already thrown off and couldn't get any headway with Inara. Grabbed Nara and put Boba back down. Same deal. The poor guy was being pummeled by these pullets!
So, change of plans! I grabbed Gus and closed him in their new coop so that he wasn't beaten up on while I went to get Myrtle and Zinnia. I figured they would knock some sense into those two naughty pullets and then Gus could sweep in and things would smooth out. (Gus, of course, sat in the coop and chirped about all the great things he was finding in there I guess.
)
Myrtle and Zinni hit the ground in the pen. Things are tense. Once again, Athena and Ottilie are like, oh crap, they look tough, we're outta here. Nara and Boba, immediately back into fighting. Zinni is not much of a fighter, so she immediately backed down. Myrtle, she fought for a bit.. and then SHE backed down, too! These two pullets are absolute tyrants!
Thinking maybe Gus being there would give Myrtle a little more courage, I let him out of the coop. Nope! Those two pullets were not going to give up and poor Gus was struggling. At that point, I did a hail Mary; I've got to get these birds to chill out and live together! I grabbed Boba up, grabbed Nara's feet so she couldn't fight, and let Gus peck at her until she finally,
finally conceded. Then I did the same for Boba.
So FINALLY things are calm out there. Gus lunged at the pullets for good measure a couple times while I was still out there keeping an eye on things, and none of them put up a fight. Looks like we're good finally. PHEW!
There are two feeders and two water dishes, so they should be okay and everyone should be able to eat and drink as needed. Last step will be helping the pullets figure out that the coop is a safe place to go and not scary. Baby steps!
Last night they had already tucked themselves into the crate by the time I got out to check on them. I put a roost in there, but either they can't see it or they dont like it. But, they sure are quick learners!
They may just feel more safe huddled in the crate for now, it's still a new environment for them after all! You can always perch train them later, though, by simply moving them to their perches for the night, a little after dark so they stay where they're put. It can take some patience, but they usually figure it out eventually. 
I'm really not cut out for this whole chicken breeding business, I guess.
Best laid plans .... Gus was probably chirping because he was in the safety zone. 
Here's hoping he's able to pull through and do okay with one foot.
