Assume a mass casualty type situation. Something along the lines of AR-558 with physical wounds ranging from phaser and disruptor hits, to concussions, broken bones, and the like.
Each Chief would be from roughly halfway through the run of their series with whatever knowledge and experience they had at that point. Each would have access to whatever kind of portable medical kit a medical officer of their time would have brought for such a situation. There are no able bodied personnel to help. No they don’t have access to a transporter.
Since we already know, thanks to Pulaski’s ageing incident, and the Picard, Ro, Guinan Kid incident, that cures are as easy as stamping a previous pattern onto them during transport, technically any one of them would be better than an actual doctor.
Throw them into the pattern buffer, upload the last stored healthy pattern from their most recent beam-out. voila…all fixed.
I know your tricks.