From the video

Video: His Legs Work
If you look at my rankings here, my top two names are Hunter and Cam Akers, but we don't have a stack group for Akers.

STACKED’s take

Negative signalValue

Top-two RB ranking but no stack group available; Lamb pivots.

Ceedee Lamb ranks Akers as one of his top two running backs, but does not select him in this draft because there is no available stack group for Akers, forcing a pivot to Hunter Henry instead. This indicates Lamb's preference for stacking in best ball format overrides pure ranking conviction for Akers.

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