SANTA CLARA — There wasn’t a lot to learn from the 49ers’ 30-9 exhibition loss Saturday night to the Denver Broncos.

Denver basically had its way with the 49ers’ reserves at Levi’s Stadium. The only early highlight for the fans who braved the heat and actually showed up was a first-drive touchdown engineered by quarterback Mac Jones . There was solid visual evidence there’s a lot less concern in, around and outside the building if Brock Purdy goes down.

Jones was 4 of 7 for 74 yards overall, and there was a diminishing returns aspect of the three series he played in the first quarter with a makeshift offensive unit that was missing four starting offensive linemen in tackles Trent Williams and Colton McKivitz, guard Dominick Puni and center Jake Brendel. Also sitting it out were Chr

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