For more than two decades the paradigm of radio galaxy dynamics has been based on flows associated with hypersonic jets. These dynamics, coming from strongly driven systems are surely very complex. The nonthermal emissions that we depend on for most of our physical information depend on nonequilibrium processes that are not well understood and entangled with the complex dynamics. Many of our basic concepts for these objects come out of insights from simple cartoon models that often remain largely untested. In this talk I will describe an effort to apply three dimensional numerical simulations of MHD jets that include explicit acceleration and transport of relativistic electrons within the flows. These calculations allow us to examine many issues connecting dynamics and emissions, and especially when combined with synthetic radio and X-ray observations of the simulated objects, let us examine a variety of simple models in common use.