Foghorn, I'm so sorry I just noticed your question about types of roos for warmth. They did not designate, but at nearly 5 week's old, I have a deep golden yellow roo, looks like a buff orpinton but with a touch of grey/black on feathers, and maybe 2 roos of the same breed as the pullets, either Iowa Blues or Blue Hamburgs.
No prob! They look like leghorns. California whites. They added 13! One died unexpectedly a few days back. they are actually very friendly so far. And oh yes, the combs are showing!