if im not mistaken,

remember when marlena was drag by the millitary into a room where she expolode??

if u pay attention, u will see a figure coming out of her while she explodes.

that explains 1 scence where 2 things happen
-the guy without organs,cause the parasite came out of it
-the parasite in the cage, is push right after the guy without internal organs

hope u understand

I wont be surprised if they make Cloverfield Versus Predalien

im seriously wondering is there a connection between the parasite and the monster
-they interviewed abrams, he said that when the baby monster scratch it's back, the parasite drop off. maybe the parasite was using the baby as a host??

if she was to explode herself, her body would have been like the dead body which we seen : only the organs missing
but in marlena case, her body shattered to bits
-nope, if the millitary tried to kill her, they wouldnt do it so brutally. all they can do its just give her a injection. as the millitary itself thinks logically and doesnt want to make a mess of their hideout.
-her body nv shattered into pices, the blood just sprayed out, if it shattered, u will see her hand,legs,head flying around
-many ppl claim seeing a figure out of the girl