Most would agree that the offensive line play last year, as a group for the season as a whole, was the weakest of all the position groups. We have not had great O line play for a long time. That being said, I would tend to think that this fall's line should be 'on paper' based on recruiting, experience, etc. the most talented we've had for about that same 'long time' as well. Not to say it should be 'great' but I think it has a chance to be one of the better we've had in the past 10 years. I have complained (many disagree with me I realize) that we have not played enough back ups in recent years and we just don't have any experienced depth. You have to build a great line over years of loading and reloading (back in the day this 'system' was called the 'pipeline' because we always had twos and threes who actually played meaningful game snaps and so we returned 'starter' type guys every year, no matter whether we had 4 seniors on the the starting five or not. Avoiding fatigue and forcing defensive linement to adjust to different types of blocks and blockers makes it harder and you wear the defense down with fresh bodies and so on.
Hopefully, Riley and Co learned something from Milt Tenopir and his time helping out. These coaches know a great deal about football but for most of his coaching life, Riley has likely never had enough overall depth (NFL teams don't have a three deep roster period and Ore State likely had about 1/3rd less players than NU period). We need to play and develop a THREE deep chart, not a two deep with names appearing in more than one position in order to make one. We have enough guys suiting up and they ought to be contributing more than just 'numbers to run out on the field during the Tunnel Walk' and for scout team practive opponents.
Bill Callahan's single biggest error during his time at NU was his dumping of the lower units (he needed to cull the not every gonna be ready for prime timers in the beginning and we had plenty of those) but he needed to triple down on the walk ons and replace them. He said frequently that having over a hundred on the team was a waste of time as coaches needed to focus on teaching those who will play. This is a NFL mentality and will not work to build a long term, successful college program. Callahan tried to run a pro type system in college, in my view, and it just won't work as you can't recruit ready to play starters like you draft and go out and buy free agents. Pro players are ready to play physically and by the time they hit the NFL they are the best of the best of the best. In college you have to teach the fundamentals and not just hone existing skills.