That Sikorsky put out a recommendation over a month before this accident that the bolts be replaced at some future point suggests it was not considered a fatal flaw .
Maybe my memory is failing, but was this not the case when the S76 blades had to be replaced many moons ago. It was only after several fatals that the requirement was more emphatic, but a new blade design had been worked on for some time. If the original blades were thought to be OK, why the radical redesign?