Any strong AD carry can be played mid (MF, Cait, Urgot, Graves, Corki, etc.) considering that many AP heroes have low hp and have lower armor. With that in mind, AD heroes can poke and effectively zone APs. However, the only issue is that AP heroes will eventually overpower AD heroes mid as it approaches mid game and if the hero has blue buff to effectively shut down the strong pushing ability of AD carries. Furthermore, AD carries are prone to CC mid laners in combination with a strong jungler since they are really squishy and push hard.