Comment on The Dilophosaurus Yawn by Qilong
They MIGHT before slippery prey.... Dilophosaurus has an especially strong posterior jaw bite. It is not marginalized towards the tip or even along the jaws, which we might expect in croc-like jaws suited for rostral precision biting.
It had very strong jaw muscles.
That ... depends. They don't always have strong jaw muscles. It has somewhat to do with position of the jaw muscles to the posterior margin of the dental row, which increases leverage and strength at the bite point without increasing size or ability of the muscle itself. In this way, the mechanic of the jaw is stronger, rather than just the muscle.
Still doesn't have the bonebreaking power later...animals had.
Shouldn't need it. Hypercarnivores typically don't mess with bone. They receive their nutrients by metabolizing more meat, or selecting species as food that tend to consume the necessary nutrients. Diloph was certainly a hypercarnivore.