WX may have been a factor
WX here was decidedly IFR as I had a VFR flight planned myself yesterday which I had to scrub due to the poor viz and heavy winds. The winds were quite strong yesterday also.
Depending on how much time they had on type, either in IFR conditions or with dealing with strong cross-winds, my guess is that the poor weather here yesterday could have played a part.
But we shall have to wait and see what the investigators findings are.