I have no opinion at this point as to why this plane hit this ridge. just too many possibilities NOT ruled out yet by the known information.
I am confused by some of the graphics, which seem (AvHerald, e.g.) to indicate impact on one side of the ridge, with main wreckage found on the other side.
The original cliff-face photos show intact forest on the ridge-top, which seems to belie the possibility of the plane flopping over the ridge after impact. Looks more like it simply hit, slammed to a stop, and then slid down on the same side that it hit.
The conflict may be due to imperfect plotting of the lat-long - a couple of seconds (location, not time) error would be enough to put one location or the other on the wrong side of a narrow ridgeline.
Just an artifact of the rock texture, of course, but there almost appears to be an eerie impression of the cockpit windows visible in the center of the gray knife-edged impact point.