The tops of the plants do show some 'orcuttii-behaviour', there is much wool and there are some dark centrals. In M. orcuttii these central spines should be very prominent, however. I still have doubts that your plants are orcuttiis, but yet, they could indeed be orcuttiis.
Also, comparing the sizes of all the plants in your photo, the orcuttiis are still quite small and that could explain why there are many radial spines (which young orcuttiis often have). We will have to wait until the plants are mature and produce flowers, then we can draw a better conclusion.
My 3 seed-grown orcuttiis (habitat seed) are still quite young. They are now 5 - 6 cm in diameter and have 2 - 4 very dark (almost black) central spines and no radial spines. On the old, bottom areoles, however, there are many very thin radial spines. The body colour is a darker green than your orcuttiis. All in all, my orcuttiis look very much like the orcuttiis on habitat photos.