If the Dolphins open the season with the same starting offensive line that took the field for the first day of practice Friday, they will be using a center ( Shelley Smith) who has never played that position in an NFL game, a left guard ( Daryn Colledge) that wasn’t on the team a month ago and a right guard ( Dallas Thomas) who played three offensive snaps last season. That group, bookmarked by new tackles Branden Albert and Ja’Wuan James, gave up many of the half-dozen-plus sacks relinquished by the offensive line on Friday. Cameron Wake beat James at least twice for sacks. “Today wasn’t the practice we wanted to have with [fumbles] and sacks,” Ryan Tannehill said. Coach Joe Philbin said “we had the ball on the ground way too much” and that stemmed from at least three poor center-to-quarterback exchanges, two involving Smith and Tannehill. Smith, who expected to be the starting right guard, instead has been shifted to center in the absence of Mike Pouncey, who is expected to miss potentially seven games after hip surgery. Smith took snaps at center during the offseason program, but his center experience during games is limited to a few snaps at Colorado State and in high school. Smith said he wasn’t informed of the position switch until Thursday but wasn’t surprised. “I’m looking forward to it,” he said. “Guys are ready to step up and fill in until [Pouncey] is back or if he’s not back, fill in the whole year.” On the first day of camp, Philbin opted for Smith as the starting center instead of Sam Brenner, who took second-team snaps there. Meanwhile, the Dolphins inserted Colledge at first-team left guard, the position he has played primarily in his career, including 16 starts for Arizona last season.