Neil should have went with his first instict, or use the slave/imprisonment angle with fat gerald and the rattlers more for more unexpected outcomes involving Abby and Ellie
I thought that would be one of the ways Neil would let Abby live
I do think the imprisonment/slavery thing will be in Part 3 along with the idea of slaves and how it relates to immunity but that's for another discussion (I predict Ellie gets smuggled, maybe even internationally, in Part 3)
But to see that flashback fukkery in the end
We can thank Haley Gross for that, and even though it still makes sense with the require work,
The ending is the weakest point of the story for me but with the required work it no longer ruins the story for me, but I understand why a number of people don't like it besides them not getting to kill Abby because they hate her.