So ur saying i should put them together now? i thought they needed to be the same size so that the bigs won’t pick on the littles.
I'd forgotten that the youngs are 2 weeks old. It's so hot down here that they would not need any heat, even at night. You might be somewhere they still need heat. You may want to wait a couple of weeks because of heat.
It's not so much what you "should" do as what you "could " do. Many of us have chicks integrated into a flock of adults and older juveniles. I do it by the time they are 5 weeks old, some even younger. I'm set up where I can do that, some people are not. What works for some people doesn't always work for others. You have to go by what you see, not what I tell you that you might see.
To me size isn't that important, it's more about maturity. Mature bantams will outrank less mature full sized fowl in the pecking order, even if the younger ones are twice their size. In your case there is a size and maturity difference.
In a big brooder with heat in one area some people would just put then together now and observe. See what happens. I'd be real nervous about trying that but sometimes it works out.
What I'd do is set the two groups up where they can see each other. Keep them separated by wire. After a week or two of that, let them mix when you can watch. Give them as much room as you can and have widely scattered feeding and watering stations. My situation is different to yours as I have adults and often older juveniles in the flock, often two or three different aged groups of juveniles. And I have a lot of room, a big coop with hiding places and over 50 square feet per chicken outside when it is crowded. And I have weather they can be outside all day every day so that outside area is available.
If you want you can keep them separated until they mature, some people do that. Or sometimes you try it and it doesn't work so you wait a few weeks to try it again. There is no one way that you have to do it, there are several ways you could try to do it. But, yeah, it would be more convenient for you if they were one flock.
the baby rooster is needing to go to our freinds home
He is not a rooster yet, those hens will see him as a chick until he hits puberty. Then they might see him as a male. And he will be a lone chick, no buddies his age.
I don't know how much experience your friends have with chickens. Since those hens free range it might work out, they might not attack him, but they are unlikely to let him join their flock. But they might get lucky. You just ever know with living animals, but I would not expect it to work out real well if they just released him to roam with their flock. The ideal situation would be for him to be a fully mature rooster but that isn't going to happen.
I suggest they pen him behind wire where the hens can see him for a couple of weeks. That gets him to accept that area as home too so he is less likely to wander off when he is released. Then see what happens when he is released. But keep that pen handy so they can put him back in if they need to. They may need to do that immediately of it doesn't work out or they may need that pen when he hits puberty, weeks or even a couple of months down the road.