Peter Gillies
Really don't agree with your theory. When we did practice auto entries in the BK 117 they were done from the most probable scenario, that is the pilot pulling power off the incorrect engine. We first simulated a single engine failure, then reached up (overhead throttles) and reduced the second engine to idle, then reached back down and reduced collective to address the RRPM light and horn.
No flare, and no rotor stall. I have done this exercise many times, and the instructor who did the checks would have done it innumerable times. Had he felt there was such a problem he would undoubtedly have mentioned it.
High hover zero speed autorotations, admittedly I have only done in high inertia machines, close throttle, collective down and forward cyclic, further unloading the rotor. Dive for a bit then aft cyclic and flare, pitch and cushion.
Never considered rotor stall in entry
Further to the discussion, if the accident aircraft was 1.5 NM from the pad he was probably no longer in cruise flight but beginning a gentle deceleration.