What happened: J.J. McCarthy has impressed team staff in New York by absorbing the playbook mentally despite having minimal full-speed work with the offense. While McCarthy grasps the playbook conceptually, he has repped the majority of calls only a handful of times in practice sessions. That creates an immediate gap between chalkboard understanding and game execution.

Why it matters: Classroom comprehension rarely translates instantly against live NFL pass rushes without muscle memory. Young quarterbacks need physical repetitions to build pocket instincts and sync up route timing across multiple personnel groupings. Relying on mental retention rather than banked practice snaps invites unforced mistakes when tempo speeds up.