Why does 0 AP Zac and 0 AD Poppy is allowed to out-damage anyone else?

http://i.imgur.com/QtCoEc6.jpg http://i.imgur.com/Hzki4AQ.jpg I checked this Zac stats and whole game he had 0 AP, ZERO FUCKING AP, and look damage hes done through this game, almost same ammount that our carries. Why does hes even allowed to deal such insane damage? When i was fighting him, his W was dealing around 700 damage accoding to death recap, da fuck is this even?
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