Huh. The tangled web of the world of licensing never ceases to amaze me.
Silly me.... I would think that a licensor would want their licensed IP to look -- and sound -- as good as possible to paint the licensed property in the best light possible, and give the licensee the best chance of success. Not to say that new arrangements of the music can't be better than the original... but it's a shame that JJP wasn't at least given the option to use some of the music.
Although... the more I think about it, I'm guessing the reason for this could be that getting a license on the soundtrack is a separate negotiation/license with the soundtrack composer/producer. In this case: Hans Zimmer.