​The Hurricanes have productive veterans returning at multiple positions, but one of the few questions on the roster is the offensive line.Miami lost four of its six main offensive linemen last year. Three of them — Francis Mauigoa, Markel Bell and Anez Cooper — were selected in the NFL draft in April, and the fourth, James Brockermeyer, signed as a free agent. Replacing four NFL-caliber linemen is a tough task for any team.AdvertisementAdvertisementAdvertisementBut Miami coach Mario Cristobal, a former offensive lineman himself, feels confident about the players stepping in to fill the voids.“We’ve got some absolute creatures at that position that have come in, and they’ve got the right temperament and mentality,” Cristobal told WQAM on Wednesday.A big reason for Cristobal’s confidence entering the season is his offensive line coach, Alex Mirabal. Mirabal was Cristobal’s teammate in high school and was on Cristobal’s coaching staff at FIU, Oregon and now UM. He has coached numerous NFL linemen in his college tenure.“Alex Mirabal is the best of the best,” Cristobal said on WQAM. “He’s got a culture and a structure that gets those guys rolling quickly, makes them very versatile. They get reps at every single position. So their knowledge of the offense, as it relates to assignments and their knowledge of the positions, as it relates to technique and fundamentals, is at a really high level. And it’s about ramping him up as quickly as possible and getting the best out of everybody.”AdvertisementAdvertisementAdvertisementCristobal and Mirabal have talented players to work with. Freshman Jackson Cantwell, a five-star prospect, is expected to start in his first year at Miami. Samson Okunlola, a former five-star prospect, and returning starter Matthew McCoy played well last year. Ryan Rodriguez, a veteran lineman who has earned the trust of the coaching staff, will likely take over at center. Former blue-chip prospects like S.J. Alofaituli, Max Buchanan or four-star freshman Ben Congdon could take over at the last remaining spot.“There’s so (many) good things I can say about each and every one of those guys because they’ve seen it,” running back Mark Fletcher Jr. said on WQAM. “These are new guys, but they’ve seen how it should look. They’ve seen the hard work that they have to put in, and they’re still the hardest-working people in the building.”Last year, Darian Mensah led Duke to its first ACC title since 1989. The Blue Devils making it to the championship game was improbable, as they went 7-5 in the regular season. But Duke’s 6-2 conference record was tied with four other ACC teams, and thanks to the fifth tiebreaker, the Blue Devils made it to Charlotte.AdvertisementAdvertisementAdvertisementDuke winning the ACC almost cost the conference a spot in the College Football Playoff. The selection committee did not rank Duke ahead of the two top Group of Five champions, Tulane and James Madison. If Miami ha