That's what I was getting at...I just don't think Kirk held the rank of Lt. during his original four-year undergraduate coursework at the academy, as some seem to assume. We know that he held the rank of Ensign on his first starship assignment. Apparently he went back to the academy after that as a Lt. and taught a course that Gary Mitchell attended (possibly as an undergraduate himself). Whether it was just Kirk assigned to shore duty at the academy for a spell or Kirk having returned for some post-graduate coursework himself (command school), we don't have any official evidence to tell us. I like to assume the latter because it plays into explaining the Saavik situation as well.