Head coach Jack Del Rio said as much in his final press conference. He said his team did not get enough inside push.
Either way, the Raiders played a laundry list of guys in the middle, because each player had their downfalls. This was supposed to be one of the deepest positions, but it is really one of the weakest.
Dan Williams is a great guy, but he clearly lost a step last season. Justin Ellis never seemed healthy or conditioned enough. Stacy McGee was also banged up. Denico Autry, Mario Edwards and Jihad Ward played the inside position out of need more than talent. Darius Latham was probably the most consistent player in the middle, which tells you about the group considering he was an undrafted free agent rookie.
Oakland has tried to fix this problem with late draft picks and veteran additions, the past few seasons. However, this is the year they should splurge on the position via a first round pick or free agent signing.