How you could use the special animations! (Imo)

Distortus Rex anims:
Large carnivores + Sauropods/Prosauropods / Carnivores + Sloths

Mutadon anims:
Literally any Pterosaur bigger than Anurognathus and any Carnivore bigger than Compys

Scorpios Rex anims:
Therizinosaurids/Prosauropods + small - medium Carnivores

Indoraptor anims:

be creative, but so far has been between two different sized carnivores