Partners are formed when two people make eye contact with one another. Essentially once the trial starts the first person you meet eyes with is your partner for the remainder of school. After that two pairs of partners are joined to form a four person team, which in the show is determined by which relics each duo took.<br/><br/>Since Azuri has been specifically averting her gaze this whole time she wouldn't have made eye contact with either Auro or Kakariki unless they specifically went out of their way to force her. That would mean that Auro and Kakariki would most likely end up being partners, again unless either of them went out of their way not to look at each other.<br/><br/>Only two people can be partners together, which is probably were the confusion stems from, as Juggs made it seem as if all three of them had become partners as a trio when that isn't the case.