Final update, all is going well, I rehomed the black one and one of the buff ones
Kept Chonky and cornflake, they get along well and work together to protect the flock from magpies
Boris the white rooster I kept in a separate pen with a feather picking hen, they get along well and I hatched two chicks from them as I was very curious about Boris’s genetics, the chicks appear white with black patches
I won’t keep Boris for much longer probably
None of them ended up aggressive at all, but they aren’t lap chickens, they care more about their hens now which is good
Cornflake ended up with weird looking feathers so I might not keep long term either
And Chonky boy has rounded saddle feathers which is odd