Woah, how come you get to have two flashbacks? Also, I'm going to guess that Burner was basically the biproduct of Great and Lord Bear's creation, which was why Jim threw her out since she's an accident.
Lord Bear however didn't care much since his sole purpose is get Lil Bear back, while Great also doesn't know about his past much. This changed when Lord Bear sensed Burner being alive and was completely out of the system.