Ok so lemme get this straight

Basilosaurus: base

Bowhead whales: gigantic head

Daeodon: more muscle attachments

Livyatan: fatass head, spermaceti and what not

Collared peccary: skull shit

Purussaurus: jaw lever, skull robustness boosts

Icthyotitan: boost to 300 metric tons

Bite force: 3.000.000 newtons

I don't believe it at all.