The offensive line has been the most inconsistent group on the New England Patriots roster over the past two years.
Is it a coincidence that the line's downturn coincided with the retirement of offensive line coach Dante Scarnecchia and the hiring of Dave DeGuglielmo in his place? If so, we might find out soon, as DeGuglielmo has parted ways with the Patriots and Scarnecchia is being brought back to fill his old position.
Of course, a few other factors have contributed to the Patriots' struggles. One of the biggest issues has been a changing of the guard (pun intended) on the interior of the offensive line, which was once manned by Logan Mankins and Dan Connolly. Both have left the fold, and the Patriots spent much of 2015 tinkering with different combinations on the inside.
Injuries have been another issue. Left tackle Nate Solder missed most of 2015 with a biceps injury, which forced Sebastian Vollmer over to left tackle (where he's not as good as he is at right tackle) and forced Marcus Cannon into the starting lineup at right tackle. (That's Cannon's most natural position, but he's a backup for a reason.)
So, while Scarnecchia might help get the most out young players like Tre' Jackson, Shaq Mason and David Andrews, there may still be some personnel questions to answer on the offensive line.