I've been mulling this over for a bit and in order to properly differentiate from NS zombie, I bet it would be beneficial but still true to the intent of Stormtroopers if the zeta took a slightly different direction. It obviously still promulgates the idea that stormtroopers clustered together in large squads but gives him a decidedly more offensive focus.
"Stormtrooper gains 40% Defense for each living Empire ally. When Stormtrooper uses a Basic ability during its turn, all defeated imperial trooper allies are Revived with 50% Health and called to assist, dealing 40% less damage. Then the Revived allies are immediately defeated.
While Stormtrooper is active, Imperial Trooper allies have +30% Defense."