There were characters who couldn't have been zombies, like: Juggernaut, Thor, and Vision.
And what about characters with healing factors? Like Deadpool, Sabretooth, Wolverine.
And what about Dr. Strange? If the plague is magic-based, he should had sensed it and surely would had some way of saving the world/universe/multiverse.
Galactus and Silver Surfer... why were they taken out like bitches???!!!
The Living Tribunal exists simultaniously in every reality, he would had put a stop to it the moment it began.
And more stuff...