No i'm pretty sure that Greco won't hurt your freestyle/folkstyle. It helped me all throughout growing up. Being able to throw and hand fighting that you learn among many other things help out tremendously. Especially the hand fighting, which I don't care what anyone says the hand fighting in Greco is so much more physical than that of freestyle/folkstyle. And from previous comments i've read in the past, who is to say that freestyle or folkstyle are more important than Greco. I mean it is an Olympic sport, folkstyle isn't.....