Not necessarily. These types not only have difficulty gaining bodyfat, they also have difficulty gaining muscle. It depends on what one considers “hard”. The easy-gainer can put on extra fat but he can also build muscle much easier. If this person followed a structured, smart eating plan, achieving a fit body is “easily” obtainable (some people have an easier time with food restrictions). The leaner guy has to eat much more food in order to build the muscle mass that the other guy does with a normal amount of calories. Some people, myself included, just don’t have mammoth appetites and find eating excess calories less-than-easy.