Seems a design change from the Huey style short shaft free wheeling unit may have created a new and different failure mode.
Those were greased units not requiring constant supply of pressurized oil for lubrication.
A question that springs to mind is why there is but a single injection port rather than two....but such a redundancy would add expense and complexity to the design.
As there is no back up....are there any warning systems that would indicate the loss of lubrication to the free wheel unit?