The data confirms Sacchi's zonal marking CB archetype — the primary fit is not accidental. DYN 8.8 (positional switching), SPI 8.5 (defensive line control), and CLM 8.67 (distribution under pressure) are the three pillars of Sacchi's four-defender block: the CB who understands space before the ball arrives, not after. The Tuchel secondary fit reflects the modern build-up extension of the same archetype — where the ball-playing CB becomes a de-facto playmaker from deep.

Nathan Bourdin is a 22-year-old French centre back who has spent his entire career — youth and senior — at Blois Football 41, the club from his hometown. He debuted in National 2 (4th tier) at 19, is now an established starter wearing #4, and holds a contract expiring June 30, 2026. The 7-match video sample was assessed by Jim Totime under Empire FGA v4.0 Lars Pilot protocol (50% Tier 3 weighting). The match register passes all four balance checks — 3 top-third opponents (including Ligue 2 Clermont), 4 away matches, 5 losing contexts.

DYN 8.8 ✅ (5 events) is the headline metric and the architectural foundation of the "Modern Libero" archetype tag. The defining event is M2 30:53 vs US Thionville (T1, Away): "Explosive acceleration to convert him in RB position." A CB who recognises a tactical gap, transitions to right back mid-play, holds the position against top-third opposition, away and losing, is demonstrating intentional positional intelligence that is rare at National 2 level. Five events across the sample confirm this is a consistent pattern rather than a single-match adaptation. DYN 8.8 for a CB is not a generic "versatility" score — it is documented evidence of Sacchi-style zonal flexibility.

CLM 8.67 ✅ (4 events, 3 positive/1 negative) — the composure data. M2 0:10: "Chest control following long pass despite opponent pressing" — scored 9/10. M2 3:38: "1v1 dribbling from last defender position" — scored as positive. These are not defensive clearances; they are technical execution events under high-pressure situations at the back line. The one negative CLM event contextualises the average correctly: he is composed in most situations but not all.

CHR 8.33 ✅ (3 events) + DMA 8.33 ✅ (3 events) — the Clermont evidence. Both metrics produced their highest events at M3 60:29 and 60:31 respectively: "Instructions to teammates" (CHR 9/10) and "Counter-attack created, leadership" (DMA 9/10). Two seconds apart, against Ligue 2 athletes, in a match Blois ultimately won. The fact that the CHR and DMA events are simultaneous is analytically significant — the instruction produced the counter-attack. Leadership and decision quality are causally linked in a single action. At 22, this is what coaches at the next level pay for.

SPI 8.5 ✅ (4 events) — defensive line control confirmed. "Good anticipation" events describe a CB who reads through-ball trajectories early enough to set the defensive line proactively. M3 43:31 vs Clermont provides the T1 validation: spatial anticipation against Ligue 2-calibre attackers works.

MCS Anti-Indicator 🚫 (25:13 vs Wasquehal) — "Foul committed — Penalty." Scored 3/10. Mid-table away match, losing context, 25 minutes in. A rash duel commitment that conceded a penalty. This is the one event in the entire 7-match sample that scores at the anti-indicator floor. It cannot be dismissed. However, the same match at 24:45 produced a CHR 9/10 "Communication with teammates" — leadership in an adverse situation 28 seconds before the penalty. The swing from 9 (leadership) to 3 (rash duel) in 28 seconds describes the development gap: the mental capacity for both elite and poor outcomes exists in the same player at the same match. Coaching can consolidate the 9 and suppress the 3. It is a development target, not a structural ceiling.

CRK anti-indicator — "Risk dribbling unsuccessful in danger zone." Overconfidence in possession near his own penalty area. At 22, ball-playing CBs frequently overextend their technical ambition. The positive CRK events (oriented control) confirm the technical ceiling exists. The anti-indicator documents that the risk assessment is not yet fully calibrated. Both assessments are valid simultaneously.

OBI/SII entirely pending. This is not a minor gap — it is the most consequential unknown in the entire profile. A CB with confirmed elite mental metrics but unknown physical profile could be a Ligue 2 starter or a National 1 ceiling player, depending on SII. The FGA 7.4 rating is built on mental/cognitive evidence. The physical dimension will determine whether 7.4 is a floor or a ceiling.