From the video

Christian McAffrey was obviously dealing with minor injuries throughout the last couple weeks of the summer... he was dealing with cramps for most of the game.
Mentioned at 3:20 – 3:57Captured by STACKED 8 hr after posting
STACKED’s take
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McCaffrey remains the primary back with all high-value touches.
Christian McCaffrey's limited Week 1 usage was due to minor summer injuries and game script rather than a role change; he remains the primary back and commands all high-value touches in the San Francisco offense, making it difficult for secondary receivers to earn consistent volume.
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