They the creation of the Reptilians and they do not literally exist as we do , they are controlled and already chipped , there's none who comes back truly but instead it's new ones who are created, whoever has more of a gentile in them and that part wakes up over the reptilian side then the enemy would now and wipe them out and replace them.
They do not posses an individuality or mostly the so called EGO the I , the consciousness part for them it's null like biorobots , they were created using the human DNA to infiltrate's between our own very specie so they can play 'within' as part of Us which they are not , just reptiles with human form.