It could be one of the buttons we add for the aura, sure. It still makes a dandy ribbon. I was putting in my two cents about where I'd slot healing on my list of priorities when it comes to sorting out the auras and abilities, which is to say closer to the bottom. That said, it could also be more of a focus for one of the subclasses, rather than the class more broadly, which makes a lot of sense from a build standpoint since not every Marshal concept is going to have a strong healing component.