To all the folks theorising over touchdown vs. threshold airspeed, I'd caution them to remember the conditions - don't hang too much significance on two *instantaneous* airspeed numbers.
FWIW, the gossip I'm hearing (not from any especially authoritiative source, I hasten to add) is that the key question to be asked will be: did anyone on the flight deck say 'I have control', and if not, why not?
R1