I can agree with scenario C for the most part, but a few of the things we know, or think we know, are not accounted for.
8. Not sure stab wounds to Christine's upper body would cause her to completely bleed out at the secondary location. Other decomp material was not present at the Sunderland site as far as we know. While she was skinny, some body fat existed and other body fluids are associated with decomp.
10. Dr Blake's statement of a partial second DNA profile from the semen has to be discounted or included. After decomp has occurred, how can one tell how many someone was raped by the same person?
13. Based on the study posted recently, a body is either scattered by scavenging animals or if left alone, the bones will not be in disarray.
What are the chances the killer found stray bones at the Sunderland site first and put them in a pile for someone to find later? Could the bones have been brought there later from another site? This would account for the lack of decomp material and the disarray of the upper torso bones - ie she did not decompose at the Sunderland site.