UP FOR DISCUSSION: - How come Nissan's Carlos Ghosn’s direct reports are leaving left and right? - Is the “The Hydrogen Transition” on the horizon? - Are down-market luxury cars stealing sales from mass-market brands? All that and much more with John McElroy, Autoline.tv; Gary Vasilash, Automotive Design and Production; Dave Sullivan, AutoPacific and Joe White, The Wall Street Journal.