TLDR: Navarro killed the scientists. Rose isn’t real.
Why is it so important Prior brings the bodies to Rose. There are many better ways to dispose of bodies without involving another person. So it really only makes sense as a writing device to lay the ground work for the final episode with a big twist.
I predict we will get the reveal as Prior goes to bring the body’s to “Rose”, only to find she is dead and has been for a long time. Travis and Rose Skeletons in the bed smoking a dubbie? Navarro has been communicating with a ghost.
This then leads to the question if rose has been dead all this time who reported the location of the Tsalal bodies. Navarro did acting as rose. And she knew the location because she’s the killer.
We the audience will get this before Liz Danvers figures it out. Leading to the classic trope where Liz slowly figures out she’s now in the cave with the killer (Navarro). Navarro evil split personality comes out. Her real name, the one good Navarro can’t remember, will be reveled to be Sedna.
This is my big theory, just putting it out there before the season finale.