So the cold fuel transits the system, waits with liquid water in its composition so that it can freeze after entering the pylon and the enhanced heat of the HE? I think that isn't likely. Again, at the temps in the tanks, there would be no liquid water in the fuel. Something Capt. Cargill suggested covers more ground; an upstream "snowstorm" that caused cavitation at the engines. The "snow" (small granular water ice) would have formed as early as in the trucks (A/P tankage) prior to uplift.
There are so many errors in what you have written that you clearly havent a clue either about phase-separation chemistry, airport bulk storage or apron hot-hydrant / hydrant servicer systems. If you dont KNOW why dont you just say nothing?