I think the rooster would be good with the cochin becouse they are both in the heavy class.Im not to sure about the other two though I think they might be to small and he could hurt them really bad in the ''mating process''
You can use any male/female you choose unless you're trying to breed true. If all you want to do is produce chicks of some sort you can do whatever you want.
I have a simply gorgeous rooster that is the result of a light brahma roo and a cochin hen. It's surprising sometimes how beautiful the mixes can be, and unless you want to show them, there's no reason not to mix them.
One of the advantages to the crosses I've made is that the production usually goes up and even egg size has gone up on most of my crosses to date. Hybrid vigor can be a wonderful thing.
