From the video

Video: Top 100 Flex Rankings & Tiers (Week 1)
Jordan Mason, he's probably the starter. It's probably a good matchup, but we don't know if he's any good at the game of football. And at the same time, um, we can just afford to wait a week to see what the split's going to be between him and Aaron Jones.
Mentioned at 21:27 – 21:39Captured by STACKED 5 hr after posting

STACKED’s take

NeutralRole

Likely starter with good matchup but unproven; wait a week.

Probably the starter with a good matchup, but unproven as a player; Cook recommends waiting a week to see the split between him and Aaron Jones before committing to starting him.

Jordan Mason headshotJordan MasonRB · MINPlayer page — value, ADP, projections, and every insight