I don't see how rough play, in and of itself, is going to cause your puppy to grow up aggressive. However, you really need to place rules (if you haven't already) on your games because you are teaching your puppy that putting its mouth on you is acceptable behavior. You might also have to worry about that behavior crossing over to your puppy (eventually dog) doing that to other people. In which case, you might have a problem. Again, that doesn't mean your dog is going to be 'aggressive' but most people are not going to appreciate having a full grown GSD put its mouth on them in any fashion!
I play rough with my boy all the time, however, he is not allowed to use his mouth with me when we play. Everyone's opinion is going to differ, but I think it's completely inappropriate behavior!
Murdock, BH - GSD
Virgil, CGC - GSD
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Tara, Reagan, Madison, and Jefferson - Aussies