Rescuers Down Under--nothing new?

My son has been waiting for some time now for the Rescuers Down Under score--I was even beginning to weaken in my resistance to the ebay auctions for the original CD release! He was certainly pleased with it, after listening to it earlier today--it had a crucial piece of the score, McLeach's waterfall demise. But we were wondering why, especially in the event of a re-release, the opportunity wasn't taken to expand on the previously released score--the McLeach/bushwacker theme was an obvious omission, a key piece of music that is repeated throughout the film. Any explanation? Randy? Michael.