RENTON — No one’s pounding the panic button.

But prove-it time is approaching for Seahawks offensive coordinator Brian Fleury .

Because after six weeks, the reigning Super Bowl-champion Seahawks are 3-3, with a widening gap between the NFC West-leading San Francisco 49ers (6-0) and everyone else. Seattle is sputtering despite a reliably dominant defense surrendering fewer yards than anyone in the NFL.

It’s not just that quarterback Sam Darnold has stunningly devolved , coughing up seven interceptions in his past four games. Or that Darnold has been sacked five times apiece in back-to-back defeats. Or that the running game has regressed without departed starter Kenneth Walker III, whose simultaneous ascendance in Kansas City only adds insult to injury. Or that Seattle’s supporting cast — Rashid Shaheed, AJ Barner, Tory Horton, etc. — has been befuddlingly underutilized. Or that Seahawks running backs have more lost fumbles (four) than rushing touchdowns (three).

One stick of dynamite does damage.…