I might be wrong here but i don't think we saw Amanda, Rose, or Lamar actually die. Mathias was a zombie, and Cyrus got axed in the back i think. Lamar was brought to the ground but we never saw him actually die. and i don't even recall Amanda or Rose in the scene. I assume they are dead as i don't think they escaped and they're minor characters but maybe they should be unknown? idk.
In regards to Lamar, Amanda, & Cyrus: Just because they dont come back doesnt mean they died. Maybe due to all the chaos that was going all around them decided to ditch the city & not come back to the group. Also, since they were not in the shelter when it was overrun, there's no way they could have died in that mess.
In regards to Rose: She was in the shelter & thus everyone who was in the shelter aside from Lydia & Alpha died.
There were toher survivors in that shelter so thus another man that looks like Lamar is the one that went down & another man that looks like Cyrus got axed.
NGL, that was a bit confusing for me but now that I came up with this explination it's good enough I suppose.
honestly this fandom is getting kinda.... confusing.... huck, wade, cam, crystal and craig are dead but theyre not. Its pretty much confirmed theyre dead when alpha is talking to lydia outside by the walkers. Theyre the only survivors left!