I have seen my secondary (and third and forth) keyword phrases that I optimize for swing
from 127th to 133rd, to 138th, back to 127th - on a near day to day basis. (All organic
SEO
on these terms).
I can see by this -
in my case (YMMV) - is there is a difference in the SERP results for
those terms I target versus my top 10 results. Those keywords in the top 10 fluctuate
nowhere near as much as my secondary (and third and forth) keywords - but they have,
and again -
in my case - moved on an almost weekly basis at
some points.
Now, you can say that algos change frequently, that SE's results vary due to the change in
the weather, or that your top #5 sites never move (or move only monthly, and that very
minor.) because of a strong PPC marketing plan you have - whatever, but this is what I've
seen.
Now, let me theorize (again, YMMV) that all my efforts are VERY organic. I have not used
any PPC, or other paid marketing for my sites. So maybe that has had an effect to what I
have seen. So I guess you can call that
speculation on my part?
I feel like I have to put my Politically Correct hat on with "
in my case/YMMV"
