I was watching videos on this and I began to wonder. I have a shaving mug and shaving soap. All the videos I have seen they load the brush with soap/cream and then use a separate bowl to build lather in. Is there a reason for this? Can I build lather in the mug with soap? I have seen some methods of building lather on the face and in the hand also, so I am beginning to believe that I should not build in the same container. Any advice would be appreciated.