I remember a long time ago Morgan was against Heaven Palace, "rigging."
But I am sure we can still rig it now, just takes more work than before.
Have the top 3-4 in each realm power down in regular arena then have lower players take their places and see if it works. Then next week, make adjustments as necessary.

Also, the ultimate arena does not affect anyone who was not top 10 in realm arena. And the rewards at rank 5 in ultimate arena are equal to rank 1 in the old realm arena... so I don't see what the problem is.