The title says it all. However, I feel like I should lengthen this post to make it a bit more respectable in front of its peers. I'll throw in the term "best practice" a couple times so viewers firmly recognize my level of expertise and instill that this idea should be taken very seriously.
Best practice.
EDIT: For clarity, the idea is to create a "Last Touch" segment of measures in Revenue Explorer based on the last MKTO Program they were a Success in. (Unit attribution would never divide in this case.)