All right just to clarify things. Injecting saves DOESNT reset gamerscore, modding your gamerscore to where you have the achievements DOES. Now Ive been using cracked DLC for the longest time, no bans, no resets, no angry letters (well cept from friends that are made cuz i got em =P) But as far as i know using them is SAFE because MS cant tell the difference whether they were put on your USB or HDD with a computer, it was downloaded or one of those fancy dlc installing discs. Hoped this helped clear things up. And thank you for reading.
P.S. My GT is ID963852 add me if youd like, just dont send me hate mail....