Jadis is seriously screwed in the head after what the Saviors did to her people. Why she let Negan live, and leave...who knows. But now that Negan has evidence that Simon cannot be trusted, and won't be too happy about Simon attacking the Hilltop either, especially with the losses they took.
So Negan has seen the helicopter now too...so is this how Morgan ends up on the western side if the U.S.? Only thing that makes sense, by foot would take a long time, car would be difficult since a lot of the main highways, and interstates are probably just blocked with abandoned cars etc. Still, a trek across America during a zombie apocalypse would be interesting.
Rick and Morgan killing the Saviors was a bummer, was hoping it would be a turning point - those Saviors incorpotating into Rick's group, and would be able to work and live without fear of punishment from a bat or iron. But..I dunno, guess Rick is still in rage mode. I can understand Morgan killing them, cause the dude is just psycho, but still. Rick must know, even without reading that letter from Carl, that Carl wouldn't have wanted that kind of brutal retaliation.