Greyzone Power Index (GPI) Scoring Guide

A comprehensive guide to advanced team evaluation using the "Big 5" framework with depth ratings and synergy calculations

Position Weights & Philosophy

Modern college football emphasizes pass-heavy, spread offense systems where specific position groups dominate team success. Our updated weights reflect this reality.

Position Weight Distribution

Quarterback (QB)18%
Defensive Line (DL)18%
Offensive Line (OL)16%
Defensive Back (DB)14%
Wide Receiver (WR)13%
Linebacker (LB)10%
Running Back (RB)6%
Special Teams (ST)5%

Rationale

QB & DL (18% each)

QB decision making crucial in spread/RPO systems. DL pass rush disrupts timing-based offenses.

OL (16%)

Pass protection enables explosive passing attacks in modern offenses.

DB & WR (14%, 13%)

Coverage essential against modern passing games. WR create explosive mismatches.

LB (10%)

Less relevant with more 3-4 wide receiver sets and nickel packages.

RB & ST (6%, 5%)

RB more replaceable in spread/RPO offenses. ST has occasional impact.

Depth Rating System

"Elite depth can elevate a team when starters are injured or need rest"

Applied as final multipliers to offensive and defensive unit scores

Offensive Depth Multipliers

Applies to QB, OL, WR, RB (56% of total weight)

5★ Elite Depth×1.15 (+15%)
4★ Good Depth×1.08 (+8%)
3★ Average Depth×1.03 (+3%)
2★ Below Average×0.98 (-2%)
1★ Poor Depth×0.93 (-7%)

Defensive Depth Multipliers

Applies to DL, DB, LB (42% of total weight)

Same multipliers as offensive depth:

5★ Elite:×1.15
4★ Good:×1.08
3★ Average:×1.03
2★ Below Avg:×0.98
1★ Poor:×0.93

* Special Teams (5%) not affected by depth multipliers

Depth Impact Example

Team A: Elite Depth (5★)

Offensive Score: 50 points
Depth Multiplier: ×1.15
Final: 57.5 points

Team B: Poor Depth (1★)

Offensive Score: 50 points
Depth Multiplier: ×0.93
Final: 46.5 points

Total Difference: 11 points (24% swing)

QB Support Framework

"Elite supporting casts can elevate struggling quarterbacks"

Only applies to QBs ranked worse than 25th - Maximum 45% penalty reduction

Supporting UnitElite (≤5)Very Good (6-10)Good (11-20)
Offensive Line+15% penalty reduction+12% penalty reduction+8% penalty reduction
Wide Receiver+15% penalty reduction+12% penalty reduction+6% penalty reduction
Running Back+12% penalty reduction+9% penalty reduction+5% penalty reduction

Example - Oregon (QB: 52nd, WR: 10th, OL: 10th, RB: 6th)

Base penalty: 52 - 25 =27 spots
Support: 12% + 12% + 9% =33% reduction
Reduced penalty: 27 × (1 - 0.33) =18.1 spots
Effective QB rank: 25 + 18.1 =43rd rank

Offensive Synergies

Elite QB elevates struggling WRs

QB ≤10 AND WR >20

WR +12%Elite QBs make average receivers productive

Elite QB + Elite WR

QB ≤10 AND WR ≤10

WR +8%Perfect passing combination

Elite OL elevates struggling RBs

OL ≤10 AND RB >20

RB +18%Great blocking makes average backs elite

Elite OL + Elite RB

OL ≤10 AND RB ≤10

RB +8%Dominant ground attack

Good OL helps poor RBs

OL ≤20 AND RB >30

RB +12%Decent line helps struggling backs

Defensive Synergies

Elite DL helps struggling LBs

DL ≤10 AND LB >20

LB +12%Pass rush creates easier tackles

Elite DL + Elite LB

DL ≤10 AND LB ≤10

LB +8%Dominant front seven

Elite DL helps struggling DBs

DL ≤10 AND DB >20

DL +10%Pressure creates coverage sacks

Elite DL + Elite DB

DL ≤10 AND DB ≤10

DL +6%Complete defensive dominance

Elite Unit Recognition

Game-Breaking Positions

Wide Receivers

Most explosive position in college football

Top 3:+12% base + 5% transcendent = +17% total
Top 5:+8% base bonus

Defensive Line

Most disruptive position

Top 3:+10% base + 5% transcendent = +15% total
Top 5:+6% base bonus

Quarterback

Elite decision makers

Top 3:+10% bonus
Top 5:+6% bonus

Standard Elite Bonuses

Running Back (Top 5)+5%
Defensive Back (Top 5)+6%
Linebacker (Top 5)+5%

Additional Elite Bonuses

Depth Bonus: 6+ Very Good units (≤10th) = +2% if <3 elite units

Rewards teams with consistent quality across positions

Reality-Based Penalties

Bad Secondary Penalty

"Terrible coverage gets exposed in pass-heavy offenses"

DB RankingBase PenaltyWith Elite DLWith Good DL
Worse than 35th-15%-6%-10.5%

Pass rush pressure helps coverage significantly

Poor Offensive Line Penalty

"Bad pass protection hurts multiple positions"

OL RankingQB ImpactRB Impact
Worse than 45th-10%-10%

Poor protection affects both passing and running games

Team-Level Synergies

Team Chemistry

"Elite units working together create championship teams"

5+ Elite Units+6%

Championship tier depth

4 Elite Units+5%

CFP contender level

3 Elite Units+3%

Solid foundation

Defensive Dominance

"Elite defense across all three levels"

All 3 Elite+4%

DL + LB + DB all ≤10th

Any 2 of 3+2%

Strong defensive foundation

Trenches Battle

"Controlling both lines of scrimmage"

Elite Lines+3%

OL ≤15th AND DL ≤15th

Physical, powerful team identity

Score Calculation Process

Step-by-Step Process

1. Convert Rankings to Base Scores

Score = 100 - (rank-1) × 100/74

2. Apply QB Support System

If QB >25th, calculate penalty reduction from supporting units

3. Apply Individual Synergies

QB/WR, OL/RB, DL/LB, DL/DB combinations

4. Apply Elite Unit Bonuses

Position-specific bonuses + transcendent talent

Calculation Continues

5. Apply Penalties

Bad DB penalty, poor OL penalty

6. Calculate Weighted Base Score

Apply position weights to adjusted scores

7. Apply Depth Multipliers

Offensive and defensive depth ratings

8. Apply Team Synergies

Chemistry, defensive dominance, trenches battle

Final Result

Final Score = Base Score × Depth Multipliers × (1 + Team Synergies)

Synergy Boost % = ((Final Score - Pure Base Score) / Pure Base Score) × 100

Model Examples with Depth

Elite Balanced Team

Multiple elite units + great depth

5+ Elite Units:+6% chemistry
Elite Defense:+4% dominance
Elite Depth (5★):+15% multiplier
Trenches Battle:+3%

Total Impact: ~35-40% boost

Championship contender level

Elite Skill + Poor Depth

Great starters, no depth

Transcendent WR:+17% bonus
Elite QB Support:QB improvement
Poor Depth (1★):-7% multiplier
Bad DB Penalty:-15% penalty

Net Impact: Variable

High variance team - great when healthy

Why the GPI Model Works

1. Reflects Modern College Football

  • Updated weights: DL & QB at 18%, reflecting pass rush importance
  • Depth matters: Teams need quality backups for 12+ game seasons
  • Spread offense reality: RB reduced to 6%, LB increased to 10%

2. Accounts for Team Building

  • QB development: Elite supporting casts help struggling QBs succeed
  • Realistic synergies: Position groups that actually work together
  • Injury resilience: Depth ratings prevent catastrophic drop-offs

3. Rewards Championship-Level Depth

  • Multiple elite units: Championship teams need across-the-board talent
  • Defensive balance: All three levels must be strong
  • Sustainable excellence: Depth prevents late-season fatigue

4. Penalizes Critical Weaknesses

  • Exposed secondaries: Bad DBs get targeted relentlessly
  • Poor depth: Teams that can't handle injuries struggle
  • Realistic mitigation: Strengths can help cover weaknesses