only way to tell is make a mark on it with a permanant marker and spin the engine over and take a look.....I don't think you'll notice much either but you may be suprised?

As far as the ring issue...ain't that funny....there not suposed to move....I am sure the vibration turns them....but it is kinda funny you can set them at 10o'clock and 2o'clock and when you pull em out there usually lined up?....maybe thats how zero gap ring were thought up?