Not even that.
Stage implicates "don't risk, look after GC" consequence.
So stage win is more meaningful here, IMO, than one day event ;)
BTW, I don't think this was a queen stage.
Average speed raise when you go downhill of course, but for one could raise more and less for another. It's pretty visible that Wout gained more in avg.spd than Ganna between T2 and finish. It's not bad measurement, it's less intuitive.