A while ago, before Rox went on a hunt with Au and Juba, he let Au know that Juba was above her in rank.
"Au, Juba, my mount has been granted a ninth-tier system by me which makes her rank in my eyes the same as Zairitz. I can not let you mount her because that would mean you are above her. But... If you can convince her to let you ride her then you can.". Rox said after mounting Juba.
Au politely bowed her head and said; "Yes, My Lord." and followed Rox on foot.
Rox knew allowing Au to ride Juba would make their journey faster but he is currently trying to build a hierarchy of his subordinates under his [Ruler's Reach] skill. In his mind, anyone who is directly acknowledged by the Seed System and given a ninth-tier system should be above the rest.
After talking to Au, Rox caressed Juba's back and said to her; "Same as I told Zairitz to not abuse her power, you shouldn't also abuse yours.".