With the new addition of assassinations, this rule probably needs to stay in place. It is one of the stipulations of assassinations that Officers are limited to 1. I also believe that the highest rank on should be the only person with the right to be on the Officer job, (unless they are AFK, then they should be set to Recruit). Before the implementation of assassinations, this might have made sense, but it just isn't important enough to change and may hurt the entrance of this RP Mechanic.