- Halo 2 Rookie
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- Exalted Mythic Member
Well, primarily, remember what the flood want; they want sentient species, which also must have enough calcium stored in them to feed upon and live on. That is clued to be what the Flood want.
Calcium is a metal that, in a weaker isotope, would be healthier for our bones. Thusly, only creatures with bones should have them, and apparantly Jackals, Grunts, and Drones don't have calcium, regardless. What makes you think that worm organisms, which are probably 1 000 times larger than cells (which in essence means less functionality), are able to create bones? The cells inside the worms have only the chromosomes to create muscle tissue and a puny brain, methinks. They can barely make a form of blood (which is also orange, like hunters).
Scientifically, Hunters aren't advanced enough as a species to be wanted by the Flood as a life form to infect.