Yes was a bit frustrated that my first attempts didn’t work. So my main concern would be that one day is to short for this event.
Edit: played some more and my original assessment was correct. At least for the power bracket where I am active. I try to find combinations that make sense with the current elemental bonusses and I still loose from teams consisting of: Panzer, Flatline, Mandrake, Nightingale, Ifrit, etc.