> That was not John Williams' doing. It was director Alfonso Cauron who told
> Williams' to abandon his old themes because the themes wouldn't match the
> new dark tone. I'm sure if Cauron hadn't made this decision Williams'
> would have been glad to bring back some old themes. But we have to
> remember, the director has the final say. Same thing goes for Hooper and
> Doyle.

How do you know this?

It's far more likely Williams decided a fresh approach would work for the film. After all, none of the previous themes would have suited style and half of them were for characters that didn't even appear in the third film.
We really can't know anything about what he would have written if he'd been presented with a different film. And that's what should be at argument here: the films themselves. They are where the music makes sense; thematic continuity be damned.