49ers vs. Lions: Breaking down San Francisco’s defensive game plan

Matthew Stafford #9 (center) of the Detroit Lions is sacked by Ian Williams #93 and Ahmad Brooks #55 of the San Francisco 49ers (Photo by Mark Cunningham/Detroit Lions/Getty Images)
Matthew Stafford #9 (center) of the Detroit Lions is sacked by Ian Williams #93 and Ahmad Brooks #55 of the San Francisco 49ers (Photo by Mark Cunningham/Detroit Lions/Getty Images) /
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D'Andre Swift, Detroit Lions
Detroit Lions running back D’Andre Swift (32) Mandatory Credit: Tim Fuller-USA TODAY Sports /

No. 2: 49ers must stack the box vs. Lions’ D’Andre Swift

San Francisco’s depth defenders did an excellent job against the run during the preseason, but navigating against a tougher Detroit offensive line might be more of a challenge.

And if the Lions’ upfront blockers are doing their run-support duties correctly, it could mean an exceptional debut for second-year running back D’Andre Swift, who’ll be tasked with taking all kinds of pressure off Jared Goff, T.J. Hockenson and a still-questionable Detroit passing attack.

Swift, who averaged 4.6 yards per attempt his rookie season, might have better success this year behind a revamped O-line.

Read More: 49ers-Lions Week 1 odds, betting lines and spread

Not if the 49ers have anything to say about it, though.

With a lack of other offensive threats, DeMeco Ryans should be able to afford to cheat up towards the line of scrimmage, an approach made easier knowing Goff isn’t exactly a down-the-field passer, and the Lions lack field-stretching weapons outside of Hockenson anyway.

Six- or seven-man fronts could do plenty of work ensuring Swift doesn’t get anything going on the ground, putting more pressure on Goff to shoulder the load.