Not quite, I started by noticing the speed of the billfish and that the typically understated speed of the Mako might make it an Orca predator. I was not certain if any of these creatures was going to be the top pelagic predator or even if these introductory observations would be substantiated after a more thorough examination.
Really, go back and read your first post again. Sure you peppered it with occasional "If"s and "It might be that"s but your preference even then was pretty naked. You didn't aprach this problem seeking examination, you aproached it seeking affirmation.

It sounds like you still believe that your favourite old Bluey still has a chance
Not really. I brough up the Blue Whale initially to highlight the lack specification as to the problem you were trying to solve. You've never defined what you meant by "top predator" so I gave you an example of a creature that could claim that title according to a fairly esoteric definition. Shaggy did the same when he mentioned disease and ahmedkhairy did the same with global warming. All of these are valid answers to your stated question, just looking at the problem from a different view point. You didn't seem to be picking up on that subtlety so evetually we started to lay the issue out bare: you hadn't defined the terms of the question were asking... you still haven't . In fact the only specific definition for "Top Predator" you seem to have been following is "Mako Shark" (which is quite close to Baja's definition ).

Moreover I provided the goal and the method
You provided neither. To provide the goal you would have had to define "Top Predator" and to provide the method you would have had to define which factors you were willing to consider as relevent. It certainly wasn't "all" factors as you've happily dismissed intelligence, enviroment or, indeed, whether these creates predate each other at all.

I'm sorry but the conclusion you were going to reach was pretty much determined by your first post. Your responses to the feedback you've been given have simply represented an ever increasing certainty of that outcome.