What do you mean try to be like them? Im guessing you mean they try to throw with Oswalt's and Zito's mechanics. Honestly I don't think that is much of a problem. I actually think thats good. Almost every kid who plays baseball tries to have a batting stance like their favorite player, so why not try to pitch like them too. On this website there are videos of various major leaguers and I compare my mechanics to the pitchers I am similar to whenever I am struggling.