yes I agree, the peculiarity is the early IFR cancellation when he was still well west of the field.
Did he cancel IFR
west of the field?
I know the crash site is west of the field, but up until now I assumed that he flew the IFR procedure as published, south of the field, at some point (most likely at the MAPt, south of the field) canceled IFR and then did something in the VFR portion of the approach that brought him far west of the field and into terrain.
But if you've got knowledge to indicate he cancelled IFR west of the field, presumably before overflying the SNU VOR (the FAF), that changes things.