Liv has historically been always healer/amp and I don't see her becoming a tank, so her replacing Nina seems unlikely. Of that's not the case then what are the options left? Vera just took the fire spot, and Lilith is still relatively new. This leaves Phys, Ice and Lightning as the candidates, all released relatively close to each other with Ayla being the oldest and Alisa the most recent. So far she had phys, lightning and fire so is it time for an ice elem one?