I'm not sure finding what happened to the vane is on the critical path. Yes it failed and everything else resulted from this failure, but this a part that is known to fail infrequently. As such a failure should not lead to 360 families losing loved ones . . .
This is a point I've raised more than once. Technically, the AoA measuring system failures were almost certainly unrelated. Given the timescale, it is the bizarre coincidence that is so hard to get to grips with. More time and the LionAir accident investigation would hopefully have spread more solid information around the world.