In the Restricted Tourney, Tournament of Ice, I have a opponent with wrong gear.
Fire weapon, Poison minion, Light minion.
@HigureTheStillWind has already jumped in with the screenshot, but yes this can occur.
This is something we are looking into in future as a way to prevent when there are not enough opponents signed up for your Tourney.
I have also closed the other thread that was reporting the same but in a different tourney.