Whether you call it prominence, placement or not eating rocks for breakfast (
) keywords should be in your content. I never said you have to shoot for a specific or exact percentage, or that you should keyword stuff, or anything else.
Whether you are trying to or not, when you put keywords on your content, you have a keyword density on your page. I'm not sure what is so hard to understand about that.
Clearly, I still think this is a matter of arguing semantics, but c'est la vie, I digress.