Four -- the number of offensive line combinations employed by the Jacksonville Jaguars last season. Four is a small number. In fact, according to Pro Football Focus, it's the second-fewest in the league in 2015.
Three -- the number of looming personnel changes within the Jaguars offensive line this season. Three is even smaller than four. Yet somehow, in this situation, three seems a lot larger in significance. While the Jaguars' offensive line was somewhat stable in 2015, the unit still didn't perform at the level it should have. And inadequacy breeds change.
Former center Stefen Wisniewski sent too many balls over Blake Bortles' head last season. He also lacked consistency in run protection. He's gone.
Former left guard Zane Beadles was the weakest link within the offensive line in 2015. He's gone, too. The Jaguars' snagged Mackenzy Bernadeau this offseason, and he's the early favorite to start in Beadles' former spot. Bernadeau will carry 49 career starts with him into training camp.
Left tackle Luke Joeckel put together a passable season in 2015, but his future as a starter is uncertain. The Jaguars signed former Steelers tackle Kelvin Beachum earlier this year. Beachum is a proven talent, but he's still recovering from ACL surgery. Most media personalities believe Beachum will steal Joeckel's role before mid-season.
A.J. Cann and Jermey Parnell will enter training camp in late July as the only pillars within the Jaguars' offensive line. Cann started 13 games at right guard in 2015 after Brandon Linder fell to an unfortunate early-season injury. Parnell will maintain his role to the right of Cann.
As Linder makes his return from injury, he'll slide into the center position to fill a Stefen Wisniewski-sized hole. The Jaguars' decision to place Linder at center was initially met with criticism and curiosity. Thanks to an inspiring OTAs performance, the move now seems more rational.
On paper, the Jaguars' offensive line looks upgraded. The left side of the line, however, is far from established. And this has to be a concern.
We don't know who will protect the franchise quarterback's blind side this season. We know it will likely be some pairing of Joeckel, Beachum, and Bernadeau. We also know that plugging Beachum in after his return from injury could push Joeckel to left guard -- a position Joeckel has grown more comfortable with this offseason. This would leave Bernadeau as the odd man out.
If the Jaguars choose to employ their famous "best five" strategy, the offensive line could shift several different times during the season before landing on an established arrangement. This could lead to a few growing pains -- variability is not necessarily the key to offensive line success.
The Jaguars could very well have enough talent on the left side of their line, but the formula is still unwritten. Securing Bortles' blind side should be a priority as training camp unfolds.