Dumb Q: any chance the anti ice wasnt turned on?
Of course there is that chance. There's a chance a flap failed, or there was a total or partial failure of the de-icing, or a crew member committed suicide, or they unintentionally allowed the plane to get too slow, etc, etc, etc, or any number of other "chances".
I'm not certain if the switch position will physically survive this crash, nor do I know if the FDR records that switch position. The heat of the fire also eliminated any chance to determine what ice had developed on the control surfaces.
The good news is that the FDR / CVR are both physically good shape. Answers will come.