Some of the theories say that Rhue killed Jeruh because of Mideans aura was in his shadow sword However,
Didn't Jeruh use the shadow sword to kill everyone in the landorian stretch?
So how did Rhue get the sword when Jeruh was still alive?
Well, we don't know that they had the same shadow sword to begin with, so its possible they are two different swords. If they are the same sword, Jeruh says that he lost the shadow sword soon after the massacre, but can't remember how, so it would be likely Rhue stole it back.
Also when Jeruh first found the sword, it was stabbed into someone and someone else was there beside him. Who were those 2 people? Did the dead person happen to be Trazians mom?
Great question! No idea really. And no one has any especially convincing answers either.
Also it was said that only 1 person survived the landorian massacre and that was Lyrra however, Slade was the brother of Serena so how come he's not from the landorian stretch?
The Landorin Massacre only involved the kids who left the settlement that night to go play in the woods. Out of those kids, Lyrra was the only known survivor. Jeruh and Midian also live, but no one knows this. The rest of the settlement, like all the adults, older kids, and Slade (and Chasta!) weren't there so they don't count.
Finaly, Who were the 2 headhunters? One was on a bridge in episode 1. He was saying that Rhue was looking for Jeruh or something and then attacked Rhue.
Rhue also met a headhunter in episode 2 and the headhunter also claimed that Rhue was looking for someone named Jeruh, but this one didn't attack Rhue
The headhunters are just mercenaries for hire. While its never explicitly stated its heavily hinted at that before Rhue was Rhue, he was Midian, and while he was, he hired some headhunters to track down Jeruh. The first headhunter attacked Rhue because he most likely thought he was Jeruh. Maybe he knew Rhue was an alias Jeruh was going by. Note that it's not a plothole that the headhunter ends up attacking his employer, just means this headhunter never directly met Rhue/Midian. The second headhunter would be one that Rhue/Midian met while hiring the help. The headhunter mentions that Rhue said he was searching for someone, and then says Rhue's name was Midian, which Rhue would have been going by at the time they first met.