I believe that anything could potentially be vital to a case. It is common for people to wear shoes, and carry cell phones, students with backpacks or not, to take a particular or habitual route to a particular destination, last known location, usual habits (e.g. always showering before leaving home), students to party or not, etc.
Sometimes seemingly usual things mean nothing, and sometimes they can be indicative and offer an important clue.
I find it interesting that two people believe they seen a video of TB, that now seemingly may or may not exist. To me, the article does not exactly say "it does NOT exist". I do not know if that is indicative of anything, but I reserve the consideration that it very well might mean something somehow.