I didn't see any inconsistency. Rock's count of 9 was approximate (he even said so). Verencat counted 10 mods in the room out of the 11. PilotBob accounted for the whereabouts and activities of everyone of the 11 except for Nekokami. Therefore, the only mod absent at the time of the murder was Nekokami. This was the only fact that appeared clear to me