There's also a significant blooming of Carl in this episode. By going to extremes to obtain a family photo for his baby sister, he demonstrates that the flame of hope burns on and some sense of normalcy remains for humanity in the future. Carl is the moral compass, even at a young age- and a capable warrior in his own right. Michonne seems to understand this and does what she can to help him obtain his goal.
The treatment of the backpacker represented the reality of the present and the acceptance that Rick can't save the world. In this respect, he's now more like Hershel was at the farm when Rick's group first showed up on his doorstep. He'll protect his group from the world instead of trying to save the world. Picking up the backpack at the end signified a closure of one chapter and the opening of another.
Anyway, that's my take on it. Great show.
I think the backpacker would have gotten different treatment if he had been alive on the return trip.
My issue with Rick is that he’s been too unwilling to give anyone a fair shake. I think that will need to change and will change.