The choppers were bunched up as closely together as possible, many probably on their tail end of fuel as they'd be landed in order of least fuel remaining. Figuring all of that out in a under an hour without creating any risk to the civilians who were already everywhere in and between would have been nigh impossible.
It was an emergency situation. The carrier was the only safe landing zone for hundreds, if not thousands, of miles.
The choppers had been flying at or above max capacity for long distance, and would have been low on fuel already. Fueling them on the flight deck would not only have taken more time but presented its own significant risk of fire particularly in the confusion and nonstandard ops environment.