I am pretty much seeing the same thing for the sites that I'm using to test the internal linking theory. I am checking them manually almost weekly and one week the site gains 5 to 10 positions for each keyword and the the next week it is back down where it started. That may be due to data center fluctuations. The sites that I am using for my tests are pretty much already ranking on the second, third or fourth page.
The sites that were nowhere to be found with for a targeted keyword in the footer pointed to the home page are still nowhere to be found for those keyword searches.
Every link is no longer a good link.