What happened: Thieneman worked from post and split-field alignments against Carolina, closing with top-down speed to get to depth. He ran the alley and finished tackles while staying competitive in coverage.

Why it matters: Chicago spent its first defensive pick since 2018 in the secondary, putting early communication and range at a premium. Steady post play and alley tackling would simplify rotations and coverage checks early in the regular season.

What to watch: Snap counts and post versus split-field usage bear tracking as Chicago advances through September.