This article is 100 percent correct! I would recommend this to somebody who's never kept chickens before.
My chickens are more likely to fight if they've been locked up for a while. As soon as they're allowed out, they chase each other around for a while.
Great article! You covered everything! One thing I would say you could use for future articles, is that when cockerels get 8-12 weeks old, their feet are generally much larger than the pullets feet.