Regarding Cortana in Halo: CEA

Halo: Combat Evolved Anniversary on the Xbox 360 received several updates to bring the original Xbox classic into 2011, and one of the things that was done was the reanimation of cutscenes using motion capture. While almost everything about the cutscenes were an improvement over the original game, Cortana was bafflingly animated by hand in a very stiff and exaggerated way. Also, while a smaller issue, she remained a static blue at all times despite changing between a variety of colors in the original game.

Does anyone have an idea as to why Cortana was handled in such a lazy way when compared to everyone else?