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Matthew Stafford is a textbook example of when this would be good to know.Another factor in the "winning" stat is when they lost, to whom did they lose? For example, Steve Young may be the most snake-bitten QB when it came to titles. The 1990s 49ers were the "dynasty that could have been", except standing in their way was a loaded Cowboys team in the first half of the decade and the prime Brett Favre Packers in the second half. The Montana 49ers rarely had to go up against a juggernaut and when they did, it showed (*cough* 49-3 *cough*).
Since entering the NFL in 2009, Matthew Stafford is 8-67 (.106) against teams that finished the season with a winning record.
Matthew Stafford: Record against winning teams | QBs vs winning teams
And, this is obviously a very limited sampling of the total QB pool, but look at the difference between Brady/Mahomes and Rodgers/Watson/Ryan/Prescott.
NFL Quarterback records against winning teams | Sports & Fitness Digest