I can appreciate the concern, a little research reveals that most DC's are former secondary coaches. I couldn't find a firm article on why this is the case but I did find that the AI answers list a few reasons. So yeah, a LB's coach or DL coach that goes on to be a DC happens (Ryan Nielsen) but its far more common and routine for them to be former secondary coaches.
AI Overview
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Most defensive coordinators are former secondary coaches because the secondary (cornerbacks and safeties) plays a crucial role in modern defenses, often requiring complex coverage schemes and a deep understanding of passing concepts, which aligns well with the skills developed by a secondary coach; this makes them well-suited to lead a whole defense, especially in the pass-heavy NFL landscape.
Key points:
- Passing game emphasis:
In today's football, offenses heavily rely on passing, so the secondary is a critical component of a defense, making a strong secondary coach valuable for a defensive coordinator role.
- Tactical complexity:
Secondary coaching often involves intricate coverage schemes and adjustments based on offensive formations, which translates well to the strategic decision-making required as a defensive coordinator.
- Communication skills:
Effective secondary play depends on excellent communication between defensive backs, a skill that is essential for a defensive coordinator to manage the entire defense.