I love these discoveries but I dislike the guaranteed follow-up by game conspiracy theorists who don’t appreciate how games are built. For any game, the odds are that it has unused assets or partially completed systems that hit the cutting room floor.
Please tell us more. Why are the assets not simply deleted when the developers realize it's not needed, especially on a N64 cartridge to save space?
Why delete it? You never know if they might reinstate it (before release that is, and why bother deleting on release day?) or the model could be used in another game, making them costs money, storing them not that much.