If you can't stop shots, you won't last as a goalkeeper. It is redundant. There are other areas of goalkeeper that can be a positive or a negative in your game (command of the area, distribution), stopping shots is the one bit of the job that is a must have for every goalkeeper.
"box to box midfielder" The area between the boxes is the midfield.
"shot stopper" as a quality of a goalkeeper. It's like saying one of Gordon Ramsey strengths as a chef is that he's a good cook, or that as a Singer, Mariah Carey's strenghts lay in her vocals. Stopping shots is goalkeeping.