I agree completely that wax can help with patina. The surface coloring does vary as you smoke. When I was talking coloring I meant the deep seated, dark brown that has permeated the meerschaum. Patina, surfacing color, migrates around as fingers, heat, or whatever move the wax around. And if the sealing wax is removed the coloring will rise to the outer surface of the meer and not be trapped under the wax. I believe that is why it is recommended that the original surface be handled as little as possible and not at all when warm, thus keeping the coloring trapped within the mineral, under the wax, growing ever darker.
Again, no empirical evidence except for that if you inspect my meers, of which I handle the bowl when smoking, not the shank, most of my pipes have mottled bowls from disturbing the original wax, yet the shanks are almost uniformly deep, dark brown. Almost ebony! If you are trying for the look of Angel Eyes' meer you have to be scrupulous in the handling, or lack of, a new meerschaum, from the first to the last bowl.