Given how commandants work, you probably want to split them up pronto to start farming the officers you want/need. You get extra weight for whatever type the commandant is, with bonuses for matching a scientists specialty, and extra skill rolls for Naval/Ground graduates where the Commandant has 20%/150 in a skill, so you can target all rounders, or improve a targetted set of skills, depending on who you have free, or are willing to replace