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Cary Edmondson-USA TODAY Sports

The San Francisco 49ers' defense is championship caliber; however, the offense has struggled, and with a record of 6-4, the 49ers are in danger of missing the playoffs.

The standard rationale for the 49ers' struggles on offense start with the lack of effective wide receivers. Anquan Boldin has been the only productive wide receiver for the 49ers with 47 catches for 630 yards and three touchdowns.

With Kyle Williams released after making 12 catches on the season, Mario Manningham's four receptions is second on the list of the 49ers' active players. The 49ers' passing game has only two reliable weapons, Boldin and Vernon Davis, who has 34 catches.

Undoubtedly, this has hindered quarterback Colin Kaepernick and the 49ers' offense; however, to blame the 49ers' offensive struggles on the lack of quality receivers fails to understand the deeper issues.

Offensive coordinator Greg Roman is on the hot seat based on the poor performance of the offense.

In addition, Kaepernick has regressed this season, and Roman, along with head coach Jim Harbaugh, is at least partially to blame.

In taking a deeper look at the 49ers' offensive struggles, we must first look at the decisions Roman has made with Kaepernick and the 49ers' offense.