Being a lefty, I have watched other lefties throw and have come to the conclusion that I need not copy the disc. Years ago when I just started playing pro, I would watch another lefty that I was impressed with. I learned quick that I couldn't do the same things with the same disc. There are four really good lefties in our state and we all throw a little different. However, if I see another good shot with a roc, I will try to do the same thing, if it's in my comfort zone.