In Voyager "Imperfection" Seven reads off the casualty list of Voyager. One of the names is a Commander Bartlett. In fact he or she is the highest ranking Officer followed by 2 LT. Commanders (McGarry and Zeigler). There is no mention of Cavit or Lt.Stadi on that list. And I'm guessing One of the 2 LCDR is the original doctor. But what would a full Commander be doing on Voyager he couldn't be a Department head with a ship of that size. I'm betting one of the LCDR was also the dead Chief Engineer seeing as Lt. Carey was a LT and second in command. All of it's confusing to me