This is unlikely, same as everything else, but have not seen it suggested before afaik - but - what if the person seen re-entering the bar, assumed to be Brian, was not in fact him?
So the video that was repeatedly scrutinized of everyone leaving the bar at the end of the evening, accurately indicated no sign of Brian, and the person who may have looked like Brian ( as Allykins mentioned upthread ) but not identified as him by his family, is because he only looked like or affected Brian's persona?
Hope that made sense, even if the scenario does not.
all speculation, imo.
Why will LE not reveal the 3 possible theories, how could it hurt the case at this point in time?
http://www.columbusmonthly.com/content/stories/2014/09/when-missing-persons-cases-go-cold.html
rbbm