The 49ers drill home ball-security after two costly goal-line fumbles by Mitchell and Demercado, with a strict stance on benching or cutting repeat offenders. Arizona’s Demercado paid a price on the sideline as Gannon’s conduct drew a $100,000 fine, while Kyle Shanahan’s approach remains intense but controlled. SF is using video reviews to hard-wire discipline and protect six points, a now-critical edge against rival divisions.