ok, then you need to do some more research to validate this "But, I didn't read anywhere that says LSI makes density irrelevant. "
LSI was what makes adsense work for content, you do not have to use exact phrases to get different, but similar ads on an adsense page.
Let's say your page that you have adsense on is about Jessica Alba, the ads shown may be celebrity, diva, model, actor, actress, gossip type keywords in the ads, and you do not have to have any of these keywords in the content of that page to get the ads displayed for these subjects.
When you go to Google keyword tool and do a search for any given phrase, it ask if you want synonyms. This is LSI and it is also implimented into the natural search results., now, you can block this in your adwords campaign with a negative keyword ad campaign and stop negative keywords (shut off LSI ) in Your ad campaign, but you can never shut it off in natural search.
It is implimented as an anti spam part of the algo, to stop spammers from using keyword stuffing, because it just does not work anymore.
It is basically a character string recognition program and it has been around since 2003.
You should always write for the visitor, not the search engines.
And on that one part I was refering to the meta keywords tag, but as I placed in an example, you can use the same keyword (s) in the title more than once and get great results.
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