Thanks for the replies! :)
It's obvious these guys aren't Cochins. I searched for a reputable breeder and drove a ways to get Cochins, and here I end up with vulture-hocked mutts. Ha!
#3 seems to have a pea comb, and has gotten green-ish feathers on his/her back. I'm leaning toward roo atm, but...
I have three supposed Black Cochin chicks, and one Buff Cochin chick. However, none of these birds seem to be pure Cochins. The "Buff Cochin" chick looks to me like a cross between a Buff Brahma and a Buff Orpinginton. The others, I have no clue about.
Your opinions are appreciated...