I was in my Grand Arena doing a battle of Ahsoka Tano, Ezra Bridger (Exile) and Huyang vs Jabba the Hutt, Leia (Boushh) and Krrsantan and I had just gone into Ahsoka's ultimate ability and used Ezra'...
Ideas
Similar case here.
In 3v3 Grand Arena tried to battle legend Ahsoka + Fulcrum + Sabine.
My team was SEE + Bane.
I killed Fulcrum and Sabine, legend Ahsoka went to ultimate mode, and buttons disappeared. The countdown continued until end of the battle.
Moreover, after battle was finished, game stated that I defeated only 1 enemy (!). On screenshot of the enemy's datacron, one can clearly see that there were all 3 characters in a team, and I killed two of them (would defeat legend Ahsoka, too, if game would work correctly)
When it comes to showing the portraits on the datacron, it will always show all 3 characters, even if you've defeated one or two. As long as your battle screen doesn't show all 3 still, then it's fine. But missing buttons are annoying