Using my Ford MPFI experience, the cam sensor only tells the engine which of the two revolutions is happening. On my SHO car, the cam sensor was a small flattened C shape that went over a rotating cylinder with half of the cylinder cut off. So half of the revolution there was metal in the sensor and half of the time there wasn't. No way did it resemble the tooth counting crank sensor or the 8-pulse-per-revolution distributor pickup assembly.
