@log0008 - Basic aerodynamic question. Can a wing stall at any airspeed? Answer - Yes, a wing can stall at any airspeed. All that matters, for a stall, is angle of attack. We don't know that THIS aircraft stalled - but the recorded speed tells us nothing one way or the other on that subject.
@ olasek - I used "cause" in the exact same way the NTSB uses the word in "probable cause." In virtually every report they publish, except those where no cause can be determined. Sometimes "cause" means simply "what happened," which is how I used it in this case. But sometimes the NTSB has been very - emphatic - in discussing "why" something happened, if they feel it involves a serious systemic safety issue (CRM, faulty maintenance practices, VFR flight into IMC, etc.)