But yeah that sentence about zombies alone makes me question the reliability of the source altogether. The current stance of zombies has shown that the zombies aren't actually brain-fuelled and that they are more just bent on murder. A swing in this direction would throw the entire storyline built up so far completely out of the window, which would just... be nonsensical.
That and the obvious fact that it's a stupid mechanic to implement into an already close-to-flawless system. Build on it Treyarch, don't change it.