There’s an excerpt in the timeline which might assist with finding the way the zombie’s the color of eyes works. At first dimension, what we should know for certain is the fact that yellow eyes means Samantha is controlling them, blue eyes means Richtofen is controlling them, and orange eyes means Maxis is controlling them. This really is demonstrated in Black Ops 1 and Black Ops 2. In Moon and Nuketown Zombies, your eyes switch from yellow to blue when Richtofen switches physiques with Samantha. In Hidden, your eyes change to orange when finishing the Maxis side from the easter time egg. This only applies for that beginning dimension though.
Origins and Black Ops 3 caused some confusion in regards to what the attention color meant because during these maps, Samantha supposedly never joined the MPD. We all know the Giant and Der Eisendrache occur within the same dimension because the beginning dimension (but grew to become a fracture), but we don’t know why Samantha never joined the pyramid (possibly this is clarified within the next game). However in Shadows of Evil, Zetsubou No Shima, Gorod Krovi, and Revelations, we certainly realize that Samantha never went within the MPD.
I had been studying with the timeline today and discovered a few excerpts that offer some insight about how your eyes work:
“The Aether Pyramid: The corrupted Keepers produce the Aether Pyramid, a tool able to absolute power. A schism forms together and also the Keepers untainted through the Dark Aether.”
“The War of Agartha Ends: Facing defeat, the Corrupted Keepers hide the Aether Pyramid on the moon within among the recently discovered dimensions. After banishing the Corrupted Keepers towards the Dark Aether beneath creation, the rest of the Keepers undertake the mantle of Guardians. Trapped at nighttime Aether, The Corrupted Keepers contort and evolve over Eons, ultimately becoming the Apothicons. They really want, most of all, to go back to Agartha.”
Now we all know the Aether Pyramid (the MPD) is really a device that enables absolute power (control of the zombies). The timeline states, “Facing defeat, the Corrupted Keepers hide the Aether Pyramid on the moon within among the recently discovered dimensions.” Out of this we have seen that there’s only One of these simple pyramids within the whole of zombies, much like how there’s just one Summoning Key. Therefore we realize that whomever has charge of the MPD has charge of the zombies. However, if the MPD is unoccupied (as with Nacht Der Untoten, Verruckt, Origins, and Black Ops 3) then your eyes could be either yellow, red, or whatever color the knights were in Origins. Jason Blundell, when requested concerning the eye colors, has stated that “sometimes it matters and often it doesn’t.” Possibly he meant it matters once the MPD is occupied, however it doesn’t if this isn’t because it’s only the Apothicons or something like that.
This is actually the only part we don’t understand. Exactly what do the unoccupied MPD eye colors mean? Within an interview with Jason Blundell, according to him the overlords the Shadowman speaks about in Shadows of Evil are the type manipulating the Margwas. Presumably, exactly the same stuff that control the Margwas are identical stuff that control the zombies/ parasites/ meatballs. My theory is the fact that once the MPD is unoccupied, the ‘overlords’ (most likely Apothicons) control the zombies. This still doesn’t explain the demonic announcer though. How come Samantha share exactly the same voice because the Apothicons, and how come her voice alternation in Origins, why is still it exactly the same voice once the map features red eyed zombies? Questions remain. . . .
TLDR Whomever is incorporated in the MPD controls the zombies. The MPD only exists at first dimension. At first dimension:
Shi No Numa-Moon: Samantha
Once the MPD is unoccupied or away from the dimension, the overlords control the zombies. In Dimension 63:
Mob from the Dead: ???
Shadows of Evil: Overlords
In Fractures: The Enormous-Zetsubou No Shima: Overlords
Gorod Krovi-Revelations: ???
We still don’t completely understand the demonic announcer.