As Twist and Shout points out, we have two very similar accidents and the bearings are the only obvious common element.
The discussion in this thread suggests that the internal component failure process may not produce significant particles before complete disintegration.
Passengers would be more confident in the fixes if the huge effort AH has put into analyzing these accidents had allowed them to reproduce the MGB failures that occurred. Without that, concern remains that the fixes are not addressing the problem.