The top two look like look like Roans, (or possibly Mallards).
That is def a drake feather on the middle one.
In the bottom pic those are different ducks right? because they look like Khaki Campbells and maybe a Cayuga.
You have a male and a female rouen....you can tell the right one is male because he is starting to get dark feathers on his head....the hatchery suprise is two khaki campbells and one cayuga.
The first 2 are about the size of a standard chicken. I got them at Easter. The last 3 I got mid june and they are much smaller.
I havent seen any of them fly.
I have a cayuga who stays with my pekins. I have 3 pekins and the one cayuga and he seems quite content. But I did get him a couple of cayuga buddies this year. I'm just waiting till they get a little bigger before I put them in with the geese and the ducks. I also have 3 fawn and white runners with the cayugas. Good luck with whatever decision you make.