you seem to be complaining because I was unwilling to restrict the construct of top predator and potentially miss a contender
Not restrict, define. Miss a contender for what? None of us know... still!

There are a bunch of definitions for Top Predator I could think of straight off the top of my head:-
1. Who would win in a fight in a fish tank?
2. Who would win in a fight in deep water?
3. Which is capable of predating the others as opposed to merely killing them?
4. Which predates the highest diversity of prey?
5. Which predates the greatest volume of prey?
6. Which has had the greatest impact on it's eco-system?
7. Which has the largest genitalia?

Can you really not see that without some sort of context you're entire premise is worthless... because there actually is no premise? You haven't established it. You've said that the "science" points to the mako as the top predator but what you've engaged in here isn't science by any definition. It's a game of fishy top trumps. And the point about top trumps is that you win by picking the right criteria at the right time... which is exactly what you've done.