>SpaceX is selling Falcon launches to Nothrop Grumman to take Cygnus to resupply the ISS -- Cygnus competes with Dragon for the Commercial Resupply program.

True, but SpaceX gains $$$ by the deal and loses no missions. The Cygnus missions that F9 will be covering were already contracted for by NASA for Cygnus. It has certain capabilities Dragon does not, so NASA wouldn't have substituted one for the other and given SpaceX more Dragon missions. The contracted for missions were meant to fly on Antares, of course, but only two of those remain and they will fly their missions. SpaceX wasn't awarded those two.