Continuity mistake: When two of the crew members stay behind to take samples, she closes the sample and hands it to him, but in the next shot, he closes it again. (00:38:00)
Character mistake: This ship's computer, 'mother', says "declention" instead of "declination" when giving coordinates of the planet.
Answer: Regardless of his android passions, David was already experimenting with the bio-goo, and he deliberately used it to impregnate Dr. Elizabeth Shaw with a proto-face-hugger in "Prometheus." In "Covenant," we learn that David later killed Shaw and is experimenting with her body because her body tissues contain human-alien antibodies that are essential to David's work (which is creating a new generation of xenomorphs).
raywest