I just had an interesting experience. I was writing an article about a recent development within my favorite niche and, about 3/4 of the way to completion, I did some research on Google. I notice my competitor had beaten me to the punch and was ranked #2 for the (exact) title I had wanted to use.
I mulled over different title options but went ahead and posted the article with my desired title. 20 minutes later I checked the rankings and found my article at #2, but more interestingly my competitor fell to spot #23.
The focus and content, and obviously the title, were the same which, to me, indicates that the top 10 results are mixed in nature. e.g. Google wants a variety of article types in the top 10, which is why my competitor got bumped right off page #1. Google wouldn't rank us both top 10 for essentially the same story(same subject and title but completely different textual copy) at the same time.
It was interesting to see the boot happen so swiftly but it's a reminder that you had better try to single out who your competition in top 10 will be for any given title and not assume all 10 articles are your competitor because they clearly are not(depending on flavor).
It also brings up the question - what If I have TWO worthy top 10 articles? Is Google ranking only one from my domain but the other (different in flavor)article could have ranked higher vs a different competitor?
With higher ranked sites getting preferential long tail keyword traffic what I saw happen tonight may actually increase between those sites. Should these sites begin writing copy specifically to single out the longtail keywords now at the risk of competing themselves out of the top 3 on other keywords?