From the episode

It didn't go anywhere. It just the quarterback play has hindered the upside, which is crazy. It's crazy right now.

STACKED’s take

Negative signalProjection

Vikings QB play hindering Jefferson's upside; team may regress.

Justin Jefferson's current production is being hindered by poor quarterback play on the Vikings; the source expresses concern about the Vikings' long-term viability despite their undefeated record, suggesting they may regress to 6-6 over the next six games, which would further limit Jefferson's upside.

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