Kurtenbach: The 49ers' could be without their fourth-string running back vs. the Rams. That's a very big deal.

"This season, the eye in the sky doesn't lie. Samuel's side-to-side agility has been zapped this season, leaving the Niners' offense's cool factor gone."

"Kyle Shanahan's ideal offense would benefit from the kind of receiver that can win one-on-one in man coverage, but the current roster lacks that capability."

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