Not sure about wings level impact, does seem like some level of bank was involved, the ground impact has a trail prior to what is a larger impact area, left wing has potentially impacted first. The differences in damage to each wing would also allude to more stress potential being on the left.
Really is quite strange. The track flown isn’t anything volatile. Just a continued start of a light base turn, and it remains that way. Recent investigations with flap asymmetry events has obvious heavy track changes, nothing really here indicates any large deviation from starting a normal base turn. Loose seat is another possibility. Started the turn, seat went back, down it went. Would explain why it remained in the base turn.