My reference to the A310MRTT was to indicate that Airbus is quite capable of designing and building tanker transports which do NOT require a 6 year gestation period.....
KC-767I development was unbelievably protracted. Perhaps that was to enable ol'Bubba's lot to obtain data for the Frankentanker, rather than to deliver a very simple aircraft on time and on budget? IAI are capable of doing so with their B767 derivatives, so why aren't Boeing?