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49ers Have Found Gold in Rookie Safety, Brock Purdy Amazed: “He Is Unbelievable.!”

Under the neon of a preseason August, San Francisco may have uncovered exactly what every contender hunts this time of year: a safety who tilts downs before the ball is even snapped. Rookie Marques Sigle — a fifth-rounder out of Kansas State — has wedged his way into the conversation with physical, communicative play and a calm pre-snap demeanor that’s winning coaches over in a hurry. In the opener vs. Denver, he stacked seven tackles and a clean open-field stop, the kind of tape that earns quick trust on Sundays. 

What makes Sigle’s rise more than a one-night headline is the fit. In a room that now includes Ji’Ayir Brown and veteran Jason Pinnock, coaches have kept the competition open — and Sigle has already rotated with the starters in practice. That speaks to process: disguise the shell, keep the feet quiet, drive without grabbing, finish square. If he keeps that rhythm in big-nickel and quarters-match looks, the call sheet on third-and-medium gets a lot braver. 

Brock Purdy felt the jolt, too. Asked about the rookie’s edge after the latest preseason run-through, the franchise quarterback didn’t waste words:

“He is unbelievable.! You feel it in the huddle—the speed, the instincts, the calm. Plays like that aren’t flashes to me; they’re habits. If he keeps stacking days like this, he won’t just help our defense, he’ll change the way we close games.”

Momentum matters in August, but so does context. The staff’s next checkpoints are clear: how Sigle handles motion/bunch communication, the timing of his late spins into robber, and hand discipline at the catch point. If those stay tight, his floor is uncuttable (core special teams + sub-package closer) and his ceiling is the piece that lets San Francisco squeeze windows without bleeding explosives.

Meanwhile, Purdy himself has been back in the saddle — even opening the Week 2 preseason game with a crisp completion — a reminder that the offense is humming while the defense reshapes its back end. If Sigle cements a role beside Brown and Pinnock, “found gold” won’t feel like a metaphor for long. 

Chiefs Head Coach Announces Chris Jones to Start on the Bench for Standout Rookie After Costly Mistake vs. Jaguars
  Kansas City, MO —The Kansas City Chiefs’ coaching staff confirmed that Chris Jones will start on the bench in the next game to make way for rookie DT Omarr Norman-Lott, following a mistake viewed as pivotal in the loss to the Jacksonville Jaguars. The move is framed as a message about discipline and micro-detail up front, while forcing the entire front seven to re-sync with Steve Spagnuolo’s system. Early-week film study highlighted two core issues. First, a neutral-zone/offsides penalty on a late 3rd-and-short that extended a Jaguars drive and set up the decisive points. Second, a Tex stunt (tackle–end exchange) that broke timing: the call asked Jones to spike the B-gap to occupy the guard while the end looped into the A-gap, but the footwork and shoulder angle didn’t marry, opening a clear cutback lane. To Spagnuolo, this was more than an individual error—it was a warning about snap discipline, gap integrity, pad level, and landmarks at contact, the very details that define Kansas City’s “January standard.” Under the adjusted plan, Omarr Norman-Lott takes the base/early-downs start to tighten interior gap discipline, stabilize run fits, and give the call sheet a cleaner platform. Chris Jones is not being shelved; he’ll be “lit up” in high-leverage situations—3rd-and-long, two-minute stretches, and the red zone—where his interior surge can collapse the pocket and force quarterbacks to drift into edge pursuit. In parallel, the staff will streamline the call sheet with the line group, standardize stunt tags (Tex/Pir), shrink the late-stem window pre-snap, and ramp game-speed reps in 9-on-7 and 11-on-11 so everyone is “seeing it the same, triggering the same.” Meeting the decision head-on, Jones kept it brief but competitive: “I can’t accept letting a kid take my spot, but I respect the coach’s decision. Let’s see what we’re saying after the game. I’ll practice and wait for my chance. When the ball is snapped, the QB will know who I am.” At team level, the Chiefs are banking on a well-timed hard brake to restore core principles: no free yards, no lost fits, more 3rd-and-longs forced, and the return of negative plays (TFLs, QB hits) that flip field position. In an AFC where margins often come down to half a step at the line, getting back to micro-details—from the first heel strike at the snap to the shoulder angle on contact—remains the fastest route for Kansas City to rebound from the stumble against Jacksonville.