SEO Keyword Density
The major consensus of most SEO Specialists is that a certain percentage of keywords must exist in proportion to total text wording per web page. This is true to a certain extent. Another issue that comes into play is keyword proximity. Not only does there need to be a percentage of 2 to 8 percent of keywords in the text, but keywords must be relatively close together in the text.
The top gun SEO Specialists will know where to place the keywords or other long tail keywords in the correct proximity. The search engine crawlers are no different than most people. They will seek the path of least resistance. The web page must be easy to crawl and make sense. This is a true art form.
When talking to SEO Specialists make sure they know that on page SEO is just as important as all of the other practices they perform. Google loves great content and organization. Make Google love you.