I wonder why people keep repeating this? From 2000-2021 (I can count this year since neither QB this year is on a rookie contract), the SB winning QB is on a rookie contract 31.8% (7 of 22) of the time. The SB losing QB is on a rookie contract 22.7% (5 of 22) of the time (or 27.3% combined). 6 of the 7 SB winning QBs are probably future HOF QBs (Brady 2x, Rothlisberger, Wilson, E Manning, Mahomes) with Flacco as the other. Of the 5 SB losing QBs, you have Wilson as future HOF probable with McNair, Grossman, Kapernick, and Goff. Best way to win a SB is to have a HOF level QB on a rookie contract. The second best way is to have a HOF level QB.