Gobert already shuts down the PnR, weak side post, and teams don't even try to drive on him. His wing defenders could be the worst in the league and he would still anchor a good defense. Half of what Kawhi does is shuttling wings directly into Tim/Tiago on drives. Replace them with Dejuan Blair and his man would go for 30 a night. Kawhi is great at making it more difficult to run offense through the SF or have a guy posted up on his side of the floor. but Gobert shuts down the easiest, most efficient part of the floor to the point that opposing teams have to shoot long jumpers constantly.