It is just impossible for natural human beings to get that big. Westbrook, Howard, Griffin, lebron are all likely using among others. Of course I can't prove they are, but you can't prove they aren't because there is no HGH testing ... I'm not saying they aren't natural athletes, they are just enhanced beyond belief .
Look at the FIFA scandal taking place now. It not a steroid scandal, but sports are a business. No one in the NBA would leak something like that .