It doesn't matter what anybody thinks about zonal, I myself used to think it was the biggest joke going, but there are hard FACTS, not just pointless stats, that zonal marking concedes less goals from set pieces. I was shocked at the news. But like i said, I think it's just easy to remember comical defending when zonal marking does fail as it seems like a man is totally free. But it happens less than you think.
Unless you're City.