Your guess is as good as mine.
When the U.S. does a missile test, a lot of things have to go right and scrubbing a launch is expensive, so you usually don't wait once you have clearance to launch.
The last test I was involved in, the range clearance window started at 20:00:00 ZULU. Range safety gave verbal clearance over the radio and launch happened at 20:00:05. There is absolutely no advantage to holding on to a missile that's ready to fire, only bad things can happen while you're waiting.
From my reading of the thread and the net, all we have is speculation that they did fuel the bird?