User blog comment:D.Dragon123/Why Haoshoku haki is useless./@comment-4899461-20130115010848/@comment-4899461-20130115011523

Also, there's no way Luffy could take out 50,000 men (even weak ones) with Armament or Prediction Haki, at least not with the same amount of effort as Conqueror's, which is practically no effort at all.