Auburn's Greg Robinson is one of the top tackles in this draft, and if he was selected by Buffalo in the first round, he could quickly overtake Erik Pears for the starting right tackle spot. Pears struggled last year and was one of the worst starting right tackles in the game, according to Pro Football Focus (subscription required).
If the Bills added Robinson it would be an instant improvement to the offensive line and provide stability at either end with Cordy Glenn anchoring the left side and Robinson anchoring the right.
The biggest improvement Robinson could add would be in run blocking, which the Bills offensive line struggled in last year. The team finished second in rushing yards last year with 2,307 yards. The issue lies in the fact that it ran the ball 37 more times than any team in the NFL.
A better statistic to look at the team's effectiveness on the ground would be yards per rushing attempt. In this category the Bills finished 14th last year with only 4.2 yards per carry.
The Bills have talented running backs with Fred Jackson and C.J. Spiller, and with a little more room to run provided by an improved offensive line, this part of the offense could be very effective.