Were all bodybuilders and we all know our own bodies. Most of us managed to learn what works best for us through trial and error. Chad is no superhuman that can predict the future of someones physique. I don't believe working with somebody as genetically gifted as Melvin or Victor is half as challenging as working with Ronnie or Gunter. Melvin and Vic are like Ronnie from 2000. There main goal is to put on quality mass and come in shredded. But Ronnie and Gunter already have tons of mass and the possibility of coming in off is far greater. A slight bit of water or fat can devastate a physique that is not exactly pleasing to the eye. Anyways, I wouldn't blame chad, all he can do is try.