Thinking on last night a little more, I think it actually showed how important Peterson is to their offensive creation ability. His confidence and puck skills add a dimension to this team that they missed last night, and if he's out for an extended period that could be a big problem for Maine.
Obviously, the talk of the town right now in Black Bear Nation is offense, or the lack thereof. I did another little research project last night, and I tallied every forward Maine has had under both Ben Barr and Red Gendron, along with their stats, and sorted them by points per game. In terms of players recruited as freshmen by Barr, the top two players in terms of points per game that didn't leave Orono after one year are Thomas Freel and Sully Scholle, neither of whom are guys you would call offensive cornerstones. Obviously, there has been much better luck with transfers, with the Scott brothers and Makar all being great pickups, and Klimpke and Parks both have comparable PPG stats so far in their early tenure as Black Bears. If there was any interest in viewing the full sheet I'd be glad to post it here.
As opposed to forwards, I think everyone would agree that in the Barr era, Maine has had a very good collection of defensemen in this time. Even so far this year, looking at the D corps, it's been very good all year with the exception of one bad game about a week ago. Maine has also routinely been one of the best in the nation in recent years at limiting shot totals by the opposition, so the numbers also bear out that the D has not been the problem at any point with Ben behind the bench.
All of this is to say, that given Barr's penchant and knack for finding good defensemen and keeping them around, and the demands and structure of his system and style of play, I do believe that Maine would only need a few true game-breakers up front in order to be a regularly competitive team, both within Hockey East and nationally. It's probably not a coincidence that when we did have guys like that, such as Bradly Nadeau or Harrison Scott, we were an excellent team and one of the best in the nation. It would be preferable to recruit them as freshmen, obviously, as then you get longer to have them on your team if you can keep them, but if they can hit other moonshot homeruns on transfers like Scott and Makar, then that would suffice too.
Tl;dr I think Maine only needs a few top offensive skill players at a time to be a top tier team, since the strength of Barr's defense and system can help carry them the rest of the way.