From the video

Video: Top 100 Week 7 Flex Rankings + Tiers
the S tier, Jir Gibbs, Kenneth Walker, Bejian Robinson, Jackson Smith, the Jake Puka. These are the five best players in fantasy football. You're starting them every single week.
Mentioned at 0:07 – 0:21Captured by STACKED 6 hr after posting

STACKED’s take

Positive signalProjection

S-tier week 7 flex play; start every week

Ranked in S tier as one of the five best players in fantasy football for week 7; the source recommends starting him every single week.

Kenneth Walker III headshotKenneth Walker IIIRB · KCPlayer page — value, ADP, projections, and every insight