It's important to remember that the training and experience requirements in DoDI 5000.72 are the minimum (bold italics added for emphasis) requirements for DoD (which, of course, includes NAVWAR). Depending on the acquisition it is very possible additional training requirements have been identified to be needed to ensure a successful acquisition outcome, that is a very common scenario.

Unfortunately we are not able to answer your question about NAVWAR specific COR training; a search of the NMCARS (Navy Marine Corps Acquisition Regulation Supplement) and an Internet search of "NAVWAR COR Training" revealed no additional information or guidance. We suggest you contact your 'COR Coordinator' for that information.