Logline
Top Secret, again.
Edit: well, this was certainly worth waiting for:
Mariner faces her past in the season four finale.
Written by: Top Secret (May Darmon)
Directed by: Top Secret (Bob Suarez)
Star Trek does this thing where formal rank isn’t actually as important as being in the captain’s in-group. Can you name anything important that provisional Lt. JG Ayala did on the USS Voyager? I sure as hell can’t, but it was less important than Harry “eternal ensign” Kim.
As much as the Lower Decks gang would like to think of themselves as unimportant, they’re very much confidants of the Cerritos’ senior staff so it’s illogical, but consistent for Boimler to be at the top of the list for acting captain when stuff’s going down.
Out of universe it’s obviously a narrative/screen time thing, I’d say you’ve just got to accept it and move on.
I’m pretty sure he was also the only command division officer on the bridge after they gave him command. At least in theory, due to differences in training, a lieutenant jg from the command track may be better suited for acting captaincy than a full lieutenant from science, especially with a decidedly non-sciency mission like flinging a warship at a wall. You need that dash of crazy that Starfleet’s command officers tend to have.