I KNOW that this is a much debated topic, but what about having SPECIFIC Necromorphs against the flood.
Here is a list of Necromorphs:
-Ubermorph (wont die)
-The Tormenter
-Brute
-Exploder
-Puker
-Spitter
-Twitcher
-Monk Slasher
-Divider
-Crawler
-Leaper
-Pregnant
-Swarmers
-Cyst
Please try to figure out SEPERATE situations where either the Flood or the Necromorphs would win. Also, please add a list of Flood forms.