Landing in a crab is no big deal. Looks a bit concerning from the flight deck, but when viewed fro the ground no big deal. Look at the Boeing and Airbus crosswind landing videos. No big deal, the aircraft will straighten it self out. I've landed at Prestwick with legal winds by the tower, but really very questionable. I've seen crabs held till touchdown and others with very slight wing low. but still in a crag, all worked well. About the worst was a rudder input just prior to touch down and the up wind wing lifting. Not a pretty sight. Watch the certification tapes of landing 777 and others with at least thirty knots at 90 degrees.