> I may regret asking, but what of John Powell's work, which I so admire?
> Are there any that he took this approach on? (Honestly, I just want to be
> sure that How To Train Your Dragon, my favorite, is mostly him)

It's funny that the guy mentions Powell and James McKee Smith; fortunately, from the information I've gathered over the years, Powell's ghostwriters generally only provide a few cues here and there, and usually not important cues either. If you want to know more, hans-zimmer.com has a lot of information along those lines, or you can ask me if there's anything specifically you want to know.

From How to Train Your Dragon: James McKee Smith co-wrote "The Downed Dragon", Dominic Lewis contributed to "Focus, Hiccup!" and "Not So Fireproof", Michael John Mollo co-wrote "The Cove" and Paul Mounsey worked on "Dragon's Den" and, sigh, "Forbidden Friendship". Other than that last one, which was a bit of a painful discovery for me as well, you'll note that these are hardly the score's significant cues; the rest, including all the big highlights, thematic setpieces and major action cues like "This is Berk", "Test Drive", "Romantic Flight", "See You Tomorrow" and "Battling the Green Death", is Powell's and Powell's alone.