muscle building aint rocket science
This is very true, but dialing it all in for a show appears to be, especially the more "assisted" one is.
Some may want to shoot me for saying that, because when one is natural, it is a very delicate balance of attempting to retain as much mass as possible (the harder part) while getting ripped.
With the assisted bodybuilder, there is so much more going on with water retention, carb depletion/loading (in my opinion, this has gotten out of hand in the last 10 years, with guys missing the timing of their "loading" and looking washed out, etc.).