Passenger injured while riding in rental car (All Available Insurance Obained)

Gentleman injured while riding as a passenger in a rental car.   Recieved money from a number of policies.  Cases like this often involve 3 or more applicable policies due to the law regarding the order of responsibility between the car in which the at-fault driver was driving, other cars owned by the at-fault party, and the injured passenger's policies if he or she have purchased the much needed Underinsured Motorist coverage.