Jack brings up a good point.
Those of us who have had the benefit of learning/flying Bell two bladed Hi-Inertia Rotor systems understand the difference between those and multi-bladed low inertia blade systems when it comes to doing autorotations. The transition is not an easy one to make. The Hi-enertia rotor systems are forgiving....where the low inertia systems demand proper application of techniques with scant room for error as compared to the Bell Rotor system.
Watching Pilots move on to the Hi-Enertia Bell systems from Gazelles and other EC products also showed the move to Bells could take some adjusting to their techniques....which some did with varying success depending their willingness to learn a different technique than what they had grown up with.
Odds are....take a long time Bell Pilot and put him into an EC or MBB product and then he encounter the need to do an autorotation for real....in the dark...might be asking a lot if you think he will get the aircraft down unharmed.
Old habits...old Monkey Skills are hard to erase and ensure the new skill is the one is used.