In an effort to make the Grand Arena Championships more balanced and competitive, EA Capital Games has announced the intent to make some changes to the way the GAC is currently played. Starting with the distribution of players in each division, one thing that will likely not change is the reward structure. Here is a look at the recent post on the EA SWGoH forums.
As stated in a follow-up post, these changes are not expected to be seen in this upcoming Grand Arena Championships season 17, but rather in the following season.