The apparent absence of rotational kinetic impact damage on the fan blades points at little to no power developed at impact. A late change of plans from 24 to a straight in 18 would have left them hot and high: close throttles, barndoors out, nose down, and by the time low energy became apparent, it was either too late due to preoccupation with some other issue, or a compressor surge (for whatever reason) prevented spooling up in time leading to the result at hand. Judging by the fire, fuel starvation appears unlikely.