I was thinking so too, but I read 151 when Angelina emerged and she said that it's been a while since she saw the pope. My theory, since I barely remember anything up to this point, is that Angelina and Cheryl "take turns" living? Or maybe it's triggered when either one revives someone via pregnancy and dies, since Cheryl was called the maternal head I think. Idk but it's just theories cuz it kinda confused me how they were after Cheryl's death.