Human Again couldn't be worked out and the sequence was cut long before its animation would have begun. The scene wasn't even audio recorded except as in demo form and it was replaced (not supplemented with but actually <I>replaced</I>) with Something There.
When the musical hit stage, the feeling was to incorporate as much Ashman material into is as possible, and the staging allowed the use of Human Again to work as well as keeping Something There in place. When the filmmakers saw how it had been "fixed" and were asked to come up with something new for a Special Edition release, they went for that sequence.
There are many sequences intended for animated films that get cut out along the way...it doesn't mean that putting them back in years after the fact is suitable. I don't actually have a problem with the inclusion of Human Again but I am dismayed that it means the original theatrical version is not available (yay for my LaserDisc).
As for Pocahontas, quite the reverse is true: If I Never Knew You was always intended for its place in the film. In this case the entire song had been recorded with the rest of the voice tracks and it <I>had been entirely animated</I> and included in the film, with many shots in final color. It was only at a last minute test screening that kids squirming in the audience saw it being taken out from the movie.
Since this wasn't an artistic choice, and not the wishes of the directors or composers, it was perfectly right to offer the originally as intended version of the film on DVD, which also reinstated a later reprise. However, the original version as released was also made available, and the changes between the two did not have any impact on anything like backgrounds, artistic or story changes.
The If I Never Knew You sequence was filmed and ready to go. It was in the original print. In that case it was a simple few cuts that eliminated the material. With Human Again in Beauty And The Beast they went back and recreated a musical sequence that had been intentionally cut and replaced in the picture. They even had to pull back Gary Trousdale to the studio to have his credited creative input!
With The Lion King, contractual credits again prevented anything other than a song by Elton John and Tim Rice from being inserted. In this case, there was no reason to change the way a scene played out (in words instead of song in the original) but by then Human Again had provided a way to bring in new audiences and the Studio wanted a new sequence.
Since they could only use material written by John and Rice, they were limited to the three songs they wrote for the musical. I would have loved Shadowlands myself, and think that would have brought great power to the middle of the film, but it wasn't a John/Rice track. Thus I guess Morning Report was judged the easiest to insert with the least story or background changes, and so that's why they went with that song for that moment.
Hope that clears some things up...I believe I've mentioned all that before 'round these here parts!
