By Madeline Coleman Hint: none of them are currently on the Steelers’ roster. View the original article to see embedded media. It has barely been 24 hours since Ben Roethlisberger announced that he is retiring after an 18-season career, one that led the Steelers to storied heights but also featured some incredible lows on and off the field. But, in the nature of the business, there is one question at the tip of people’s tongues: who will replace him as the Steelers quarterback? Pittsburgh running back Najee Harris was asked by CBS Sports who he wanted to be under center next season, and the yo…