What do you mean by “shtarke Ger” and “shvache Ger”? Is that like being a little pregnant?
Chazal knew the Ger and knew human psychology. Chazal admonishes us not to bring up the Ger’s past to him because the Ger doesn’t forget those who raised him, and those to whom he owes Hakaras Hatov to, and those he loves, and he doesn’t break ties. Chazal doesn’t expect the Ger to be more than a human being.