They are talking about evolution on the subway and Mohinder says that we are variations of the last model. And Peter respondes by saying "Or Cheap knock offs of our fathers"..Peter & Nathan both have powers and are from New York. And Sylar apparently had a secret hideout in New York, and supposedly Peter and Nathans dad committed suicide. So Maybe when sylar first got his powers he realized he couldnt controll them so he faked his death to get away from his family so he wouldnt hurt them.