bluntforce - 6:27 pm on Dec 15, 2012 (gmt 0)
6 minute snapshots of a tracking script ignores the other 90% of the hour. Are those snapshots once an hour, once a day, only when there is an increase in mobile visitors? That isn't defined.
If those snapshots were towards the top of the hour and the site had a younger person focus, I could see a spike in mobile visits in between class times as normal. But, that information hasn't been provided.
A complete day's server log allows analysis of the overall traffic, including requests for images, scripts and css. If images load as pages scroll, you can of course see those user actions.
It is possible that the zombie phenomenon is due to mobile devices, I just don't feel comfortable arriving at that conclusion based on script excerpts.
FWIW: I use server logs with an analyzer and with a database program, GA and PIWIK. They each have their purpose.