[spoiler]Amy is taken over, though I think it was basically to shut her up about what she had seen. It is rather odd that they never tried to convert Carolyn, considering that they expected her to spawn. And maybe their grandiose plans caused the Leviathans to bypass Chris and Willie. It does seem that there is a definite pecking order in the Leviathans. There are those who are taken over (Elizabeth, the Todd's, David and Amy) and those who made sort of deal and are there by their own choice (Bruno, Sky, Nell Gunston) [/spoiler]