Not sure if this is known, but weekly training reveals if a rookie QB has Superstar X-Factor development (Madden 22 PS4) : r/Madden
Madden 21 Reveals New X-Factor Abilities For Wide Receivers And Tight Ends - GameSpot
Madden 21 Reveals New X-Factor Abilities For Wide Receivers And Tight Ends - GameSpot
Gridiron Notes: Madden NFL 21 Next Gen Stats Deep Dive
Best Buy: Madden NFL 21 Standard Edition Xbox One [Digital] DIGITAL ITEM
Madden NFL 21 Reveals Some X-Factor Abilities For Defensive Line & Linebackers - Operation Sports
Make stars feel like stars' - Why Madden NFL video game designers created 'X-Factors' - ESPN
UPDATED* Madden 21 X-Factors: EA confirms new DB and LB Abilities, Pass Rushers, WR, TE, QB and HB X-Factors, Lamar Jackson, Drew Brees, Patrick Mahomes, Tom Brady & more
Title Update: October 4th - Madden NFL 24
X-Factor Abilities List - Madden NFL 21 Guide - IGN
Madden 21 Reveals New X-Factor Abilities For Wide Receivers And Tight Ends - GameSpot
Falcons' Madden 21 player ratings are out, and fans are going to hate them - The Falcoholic
Madden 21 Reveals New X-Factor Abilities For Wide Receivers And Tight Ends - GameSpot