SANTA CLARA – All was not lost Saturday night, even if the 49ers’ preseason opener was, in 30-9 fashion to the Denver Broncos.

Caution must be exercised when judging a preseason game, much less this debut in which almost all would-be starters were safely stashed out of uniform. A strong start against the Broncos’ true starters (and 49ers alumni club) was followed by clumsy efforts from the 49ers’ reserves.

Here are the highs, lows and good deeds that went down at Levi’s Stadium:

HIGHS

The Hulk, also known as undrafted defensive tackle Sebastian Valdez, made a Marvel-ous NFL debut, so much so that Kyle Shanahan said he “flashed the most” in the preseason-opening loss to the Broncos.

The 49ers drafted and debuted two rookie defensive tackles – second-rounder Alfred Collins and four

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