From the video

Through two games, they have given Kalon Black a decent amount of work and they do have him out there taking carries, but I think it's also important to note that in both games, uh, the Niners just dominated Gamecript
Mentioned at 22:15 – 22:33Captured by STACKED 6 hr after posting
STACKED’s take
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High-end handcuff whose usage is tied to dominant game scripts
Kalon Black is receiving a decent amount of work and carries, but the source views him as a high-end handcuff rather than a starter, noting his usage is heavily dependent on game scripts where the 49ers dominate.
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