It may or may not, but keyword density should not be a focus of creating posts. People used to recommend various densities based on the length of a keyword. But keyword stuffing can seriously hurt your post's rank and your trust value in Google. It will also make your content awkward to read for visitors.

The only thing you might want to watch out for it accidentally using a KW too much. That happens occasionally just because we are focusing on a subject.

It's very possible (and happens to me all the time) to rank a post for a low-competition keyword using it once in the title and once in the first paragraph of the content. That's it :)

Honestly I think the "virtual wave" or the major shift in the way google ranks has made keyword density something not to think about much anymore. I believe now it is about rich ,meaningful, correct, and helpful content wrapped up in a pretty bow. Basically knowledgeable and witty content on a well designed user friendly website. Good luck. Have fun. and don't give up if u hat a road block, just remember how to avoid it the next time.

The way you put all this stuff sounded funny. Guess I'm not there yet.