By Daniel Bates For the first time since 2004, the Pittsburgh Steelers will start the season without Ben Roethlisberger on their roster. Historically, the Steelers look to build through the draft. But according to Pro Football Network’s Tony Pauline, the team has a few QB targets in free agency this offseason. Pittsburgh reportedly “loves” Liberty’s Malik Willis. And they’re also “targeting free agent QBs Mitch Trubisky, Teddy Bridgewater, and Jameis Winston.” Willis is seen as perhaps the draft’s biggest boom-or-bust prospect. At 6-foot-1, Willis is the shortest of the projected first-round q…