How many recently separated   

I got qualified in an AS-350 B2 & B3 in the mid 2000's.  Didn't fly those two a whole bunch, but that particular aircraft is a tough one to hover all around, especially when a pilots muscle memory and motor skills have been programmed to the exact opposite.  

It is true that a the pilots who are more experienced in one design and transition to the reverse design will have issues.  That can be worked out.  Remember, as professional pilots, we are all trained to a specific aircraft [or 2] and that training is airframe specific.  

My view on the 60 guy not being able to hover the 350, it sounds to me that the instructor in the aircraft wasn't doing his or her job.  The instructor should have been prepared for the hover deficiencies and taken that into account and provided some short, meaningful instructional tips on the aircraft differences and idiosyncrasies of the two machines. 

V/r