Your question: Your answer: It's your shave. Enjoy it your way. Using the same dish to lather in will only eat up your soap faster. That's not necessarily a bad thing; now you have reason to buy more soap! Most folks load their brush from the soap that is in one bowl, then take it (the loaded brush) to a different bowl to finish whipping up the lather. But if what your doing works for you, and you like the results, who are we to argue?
^^^ I do that with Arko pressed into a bowl and get a great lather that way. I just finished up my first stick of it and it lasted a bit over a month but I have no idea if that's using it up faster than using it any other way.