I would have to read up on the nose wheel steering, but perhaps when you use the tiller, it disengages the rudder pedal steering. This could complicate things just a little bit...I also wonder why the crew didn't reject until AFTER leaving the runway? So many questions.
I usually don't pontificate on mishaps prior to the "findings" being published, but I would agree that it sure looks like it could be a result of weathervaning. Even if it isn't, it sure raises my awareness when the crosswinds are stiff!!!
That will be an interesting report to read when it's out.