I'm not going to read this point for one simple reason, I don't think it matters much. Why? Two reasons. First of all, even if keyword density or freuqency matters today, there is nothing indicating that it will matter tomorrow. The search engines can easily just decide to stop noting that factor. Secondly (and most importantly) it is a waste of one's time and resources to worry too much about these types of petty details. One's time and effort would be much better spent improving the content on their site, creating business partnerships, learning more about their customers needs and wants, etc. That's the road to building a successful online business. Not trying to figure out some magic number which in and of itself has no real business value and may not even have any seo value.