She sounds as though she knows taking the exam makes her a commander by rank.
Yeah, emphasis on the pronoun. Taking the same exam might make Nurse Ogawa a Lieutenant (j.g.), or Captain M'Benga a Commodore.
So, in other words, Chief Engineer Logan needs to STFU.
Picard listened to advice from his juniors. No reason LaForge should refuse advice from his seniors, from Logan's POV...
But yeah, Logan ought to know that there's no way LaForge could give up the command and turn it over to Logan. LaForge would stand trial for dereliction of duty in that case.