If I had a brain Id be dangerous 🙂

I agree, when fitting propellers to Griffons (or Merlins) with a torque wrench, the engine starts to turn at about 500 lb ft. The only reason you can pull them through by hand is because the blades are over 6ft long. Surely it would take a windspeed of at least 200mph to turn them?
As for one engine being tighter than the rest, there may be a grain of truth in that as engines do vary, but unless the difference is minute then that engine must be Shagged. Would you want to fly knowing one engine was tight to turn? Don`t think so.

Oooops, sorry Pete, I forgot about you when it came to Griffons, post suitably ammended. Bex