I agree, the crew did a perfect job of reconfiguring to a cleaner approach configuration and added 50 meters to their impact point. The last three second flap addition would only possibly help the flair lowering the stall speed and increasing lift. Adding them before the flair would have been detrimental. If they didn't get all the way to full maybe what ever they got would help some. Since nobody trains for this situation because it never happens now that it happened why not put ourselves in their position and think of the alternatives available?