Do you remember the OL catastrophe in 2013. Lost 2 starters and a key reserve early in the season off the line, they were terrible. How'd the same line do in 2015, same players 2 years later?
There is every reason to believe the line will be better. The players are finally experienced, something we lacked at most positions the last two seasons. Richman and Colby are in their third season, usually where our linemen get big enough and experienced enough to really play in the Big Ten. Now we have an entire line of guys that are much bigger than last season and Dunker is the only guy that hasn't played his current position, although he's played other line position. Everyone that's seen the scrimmages say Jones has significantly improved. He had only one direction to go-he couldn't possibly get worse.
Had a lot of weird things happen on the line. Losing Britt and Ince pushed the youngsters into starting. Davidkov's career end stuck was with a bunch of bad options are right tackle.
Then the simplest reason for improvement, football players, indeed most athletes, get better at their game the more they play.