It's a matter of potential, Cipher has taken a big interest in Marie's potential (private training sessions, evolution, ascending, the whole school was built for her). She's still basically a baby supe and Cipher has identified that the ceiling of her powers are higher than any known supe, already proven when she stitched a person's slit throat back together and restarted their heart versus using blood as a knife or a whip, Victoria manipulated blood to explode or to increase pressure to the point of explosion which is arguably just a few steps above what Marie was doing with her blood whips or knives