Its fairly obvious that whilst there was a significant crosswind component and it was gusty, there was a large rudder input to reduce the crab angle that exceeded what was actually required, its an elementary handling mistake, which if im guessing comes back to basic skills and capacity issues. Unless of course someone can explain to me why a transport aircraft is rudder limited below its xwind limitation, in which instance they would have been blown to the downwind side of the runway and not over corrected to the upwind side.
It happens when the PF stomps on the rudder.