If it is a simple as "a destroyed nest is a destroyed nest", or "destroying nests is bad or it isn't", then size of burned blocks should not matter. That would make it NOT simple.
I'd sure love to hear the reason they don't burn in February
I am pretty sure they DO burn in February. Like us, it is hard to do all your burning in the short winter season and some areas, they WANT growing season burns.
They started burning Oakmulgee about a month ago maybe longer, it takes time to burn a couple thousand acers. Besides, one nest with one egg in it that looks to be busted by a predator not the fire isn't hurting the population. That hen is probably already nesting again. The fires didn't burn all the woods in that area, there are still woods in that area that haven't been burned.
I noticed that as well. Again, all is not as it seems. One egg shell in a burned nest could very well mean the nest was already destroyed by a predator before the fire. Remember 50% of the nests never make it to hatch.