Schutzhund training is a sport, for the young 11 months it is almost a game. What is used - not agression, but your dog's passion. Your dog doesn't attack the person, he attackes the suit. I trained my GSD together with my friend, and, no problem, three of us were sitting in one place, he was drinking coffe, petting Damire after that awesome session. But...Your dog should pass obedience first, because that what you are asking about is further in the course, as he must attack on command, release on command, everything on command only. You don't have your puppy, yet you made up your mind and all your plans about him. What if his talents would be of a sniffer? Or, life saviour? There are another 20 certificates for working dogs besides Schutshund.
Some dog who attacked some man had some reason for doing it. All these learned positions do not encourage your dog to attack, absolutely opposite, he will wait for you to command. There also is a course of "provocation", trained dog wouldn't do a move.