...Or then Bashir was kidnapped out of uniform (he doesn't sleep in it, after all, unless he has been drinking a lot with the Chief), and his Dominion captors provided him with suitable rags from outdated stock, throwing our timeline conclusions into chaos. 
The one Commander on the list would have to be somebody from outside the chain of command, lest poor Cavit suffer from an inferiority complex. But the CMO slot is already taken. Who else could be full Cmdr without being Cavit's superior? The ship's Counselor, perhaps - but Janeway doesn't say this person would have perished, she says in "The Cloud" that the ship never embarked one. So, who was this mysterious Commander J. Bartlett? Perhaps the Chief Engineer, who'd spend all the time down with the engines and never challenge Cavit's authority?
Timo Saloniemi

The fairly easily readable list of casualties that Seven examines in "Imperfection" establishes the names of two Lieutenant Commanders and one full Commander. Never mind that those are in-joke names from "West Wing", they supposedly still are real in the context. Since the ship had an XO of LtCmdr rank only, we would do well to minimize the number of high-ranking officers aboard the ship at any stage. Thus, one of the LtCmdrs on the list would be the otherwise unnamed CMO; the other LtCmdr could be a department head from one of those departments that subsequently were led by surprisingly low-ranking officers, such as Ops.The original unnamed CMO on Voyager was also a Lt. Cmdr, before his untimely death.
The one Commander on the list would have to be somebody from outside the chain of command, lest poor Cavit suffer from an inferiority complex. But the CMO slot is already taken. Who else could be full Cmdr without being Cavit's superior? The ship's Counselor, perhaps - but Janeway doesn't say this person would have perished, she says in "The Cloud" that the ship never embarked one. So, who was this mysterious Commander J. Bartlett? Perhaps the Chief Engineer, who'd spend all the time down with the engines and never challenge Cavit's authority?
Timo Saloniemi