Based on previous conversation in #jenkins, it is my understanding that all of the API's surrounding "DependencyGraph", "getUpstreamBuilds()", and "getDownstreamBuilds()" functions do not apply to "pipelines".
I ask because the wiki for the JobFanIn plugin says this: "This plugin can be used with Build Pipeline, Delivery Pipeline etc.", yet is based on all of the aforementioned API's.
However, I was thinking that maybe the use of the word pipeline there is different from the modern definition of the word pipeline.