This might be a silly question, but why does it seem as though everyone accepts at face value that the vials of reddish liquid which Rachel was waving around & ultimately destroyed were actually Kira's bone marrow? Given the likely scientific value of the bone marrow (not just to Cosima, either), isn't it more logical that Rachel was using decoy vials to force Sarah's hand at a particularly stressful moment, and that the real bone marrow was safe elsewhere?