Understandably, with only two days of spring practice completed, first-year Michigan offensive coordinator Doug Nussmeier is reluctant to make any declarations about the Wolverines’ offense. Nussmeier, in his first news conference on Thursday since his hiring last month after two seasons at Alabama, said he wants to find the offensive puzzle pieces this spring and then see how to fit them together by the start of the season. Michigan has had two practices, will have next week off for spring break, before resuming the final 13 practices, including the public scrimmage on April 5 at Michigan Stadium. While he is making a transition to Michigan – he joked that while he’s enjoying Ann Arbor, the weather is a huge change from Tuscaloosa, Ala. – the players are making the transition to Nussmeier and his offense. He was hired after Al Borges was fired after three seasons with the Wolverines. That means learning a new playbook and terminology. “We are trying to install (the playbook) in a progression that makes it friendly for everybody,” Nussmeier said Thursday. “I don’t know you ever put a percentage or number on (how much will be installed by the end of spring practice). “The biggest thing for me is how fast and how well our players grasp what we’re doing. We’ll go as fast as our players can go. They’ve worked extremely hard. We’ve got a bright group of young men, (and) I think they’ll grasp it very quickly.” Michigan got a boost Tuesday when veteran quarterback Devin Gardner, the starter last season who missed the bowl game because of a left foot injury suffered in the regular-season finale against Ohio State, was able to practice. Gardner was expected to be limited this spring. “We want to bring him along at a pace this is comfortable,” Nussmeier said of Gardner. Gardner, who said this week he weighs 220, about 15 pounds heavier than his playing weight last fall, is sharing first-team reps so far this spring with Shane Morris. Morris, as a freshman, started the Buffalo Wild Wings Bowl. Russell Bellomy and freshman early enrollee Wilton Speight are sharing the rest of the snaps. Nussmeier said he’s impressed with Morris, but noted his youth. “When you play a young player like that (in a bowl game), the thing you’re looking for, ‘Is the game too big? Is the moment too big?’ It wasn’t for him,” Nussmeier said. “He performed. Obviously, there’s a lot of things he would have liked to have done better. “The biggest thing for Shane, there still is a large learning curve, and he’s worked extremely hard with the system and he’s got to get better each and every time.” While he offered very little into what he would like to plan for the offense, Nussmeier did say he’s not beholden to a one-back rushing attack. Derrick Green and De’Veon Smith were freshmen last season and utilized more toward the end of the season, Justice Hayes, who will be a junior this fall, also improved. Drake Johnson, out last season during his redshirt freshman year with a knee injury, will be limited this spring. “We haven’t established a runner,” Nussmeier said. “There’s a group of running backs right now, and that will be an interesting competition to watch develop. “You’d like to use multiple backs. You look at the pounding the running backs take these days and how physical the game is. One back carrying the load all the time makes it awful difficult to stay healthy and sustain success over a season. I think you can accomplish the same things as an offense and get more guys touches.”