Based on current stats, Ter Stegen may have not got a better form than under-pressure Courtois.
With two more games played, Ter Stegen has one clean sheet less and four more goals conceded than Courtois.
Moreover, Opta stats show the Barca goalie's saves percentage in La Liga this season is the second-lowest of any regular goalkeeper (Eibar's Marko Dmitrovic – 54%).