No, that is a strong contributory factor but the primary cause is that she landed too close (and with very good sight of) the other running helicopter.
Crab,
What you are referring to is the result of several factors, not root cause. Flying your helicopter into another one sitting on the ground is a result of several factors, and when analysing this you can identify the root cause, which the collision it self is not.
The root cause was what the police has taken action on after this happened and changed, and that was the marginal clearance between the two pads, which has been a latent problem for a long time.
The crew parking the helicopter incorrectly was a contributing factor. The complacency (easy to get after 22years) of the landing pilot being used to land on its marked pad, and never seen helicopters parked outside their designated pad in 22 years and 16000+ hours. The SOP's, rain, end of shift, training, habits, pilots nearsightedness, etc. All contributing factors.
Take away the marginal clearance of the 2 pads, and we would not have this thread.
From the NTSB report, the helicopters would have less than 2 feet tip separation when running and parked on it's markers, as the rotor diameter of the OH58 is 35 feet and the free space between the two pads center was 37 feet. Would be ok for one helicopter rotors running at a time, but very close and no room for errors with 2 rotors running.