I suspect when it comes to doling out the celebs Ringer, potential, duffer or Benched the producers are more likely to favour those who are proven good teachers and choreographers, it's an entertainment show first and foremost they would rather have a good show over being fair.
Giovanni has been seriously favoured in that department but I can understand it too he has consistently produced good quality dances.
The female line up needs a bit of a shake up a lot of the current females haven't produced many memorable dances or partnerships outside of Oti and Katya. I like Diane but she just doesn't seem to get the best out of her students which is why I suspect the producers will not be giving her a contender any time soon.
Maybe it’s her fans but I truly can’t bear Diane.