Priming is only there to ensure suffecient start pressure in fuel rail, and it does it only sometimes depending on where the engine has stopped.
If it is close to a TDC sensor notch this will be picked up, and cause a RUNNING signal to be received, if not it wont.
Most engine stop in the same postion but not always, this is why they oftenm wear a particular point on the ring gear and give trouble with worn teeth on it.
tabetha