I Won!

In his plans, Trinidad accounted for everything, including the despicable personality of his opponent and he devised counters for it.

When he decided to take Sebastian along for this epic showdown, he already guessed that the despicable Big Daddy would aim to eliminate him first which was the reason why he gave Sebastian specific plans.

Originally, he felt reluctant to go with this plan since any mistake could lead to Sebastian's death but the young Leviathon's show in the test impressed him.

He believed that even against an opponent as powerful as Big Daddy, Sebastian would be able to stay alive for a second to allow him to attack.

To his surprise though, Sebastian's performance exceeded his expectations. 

As for Big Daddy, as the old predator that he was, he already saw almost all of the different species of beasts in Oceania having traveled all 7 Great Seas during his youth when he was still an enthusiastic Thresher Whale.