Look as far as I can tell your realm rank is base don your UA rank. SO if the highest ranked person in your realm in 3 in UA they are #1 in realm.
SO yes I get what if you are 30th making you 10th in realm and 9th in realm is at 18 in UA. ANhaving issues changing your realm rank, but I dont think it will be an issue in the long run.

Just reduce UA rewards and give rewards for realm and UA with hodling #1 in both equals what you get now for #1 in UA Simple. Adding 2 different arenas would be nice, but could come later