Tony kills Kim, someone else kills Kim's husband, and at the end of the season we see Jack holding his grandchild for the first time, and then placing the baby on the ground in front of a ball and a gun, imploring a choice between the two.
Nah, he just put in a space capsule and shoots it off into the great wonder. The Power of a Jack's DNA -even a quarter of it- is just too much for one planet to bare. "You will walk among them, my son, but you are not one of them. You will be destined to live amongst those people whom I've sent you to protect. Make me proud, my son."