In my experience this kind of damage is typical of slugs/or whatever initial damage, it attracts slugs. Once this kind of partial spoilage occurs, it attracts all kinds of pests, damaged area will keep spreading and the entire head will be ruined. I've had better success salvaging the head by harvesting immediately and cutting out any part that I wouldn't want to eat.
In any case, to me, the flower buds look like they are getting ready to open. This can happen, too, due to the damaged cells triggering the "We're dying! Hurry up and mature!" plant hormones.
Learning never ends because we can share what we've learned. And in sharing our collective experiences, we gain deeper understanding of what we learned.