TERMINUS MO - Are you speaking from personal flight experience of the EC225 or just an opinion in general??
Technically speaking, the part of the shaft that is failing is not subject to any more torque than it was in the AS330, AS332, AS332L1 or AS332L2 as all it does is drive the MGB oil pumps. I am not sure torque is the root cause but this is a very ill-informed opinion as I am a Pilot and not a design engineer.
DB