At one point, the Professional Football Researchers Association recognized a team by the name of the Syracuse Pros as joining and leaving the league in 1921, but the league has not recognized the claim, and the PFRA has backed off its assertion in more recent years.
According to Bob Carroll of the Professional Football Researchers Association, "The Cardinals didn't defy the league," Carroll said.
;All-Pro: This committee researches AP and UPI awards and All-Pro teams.
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;Pre-NFL Pro Football Committee: Researches all professional football prior to 1920, such as the Ohio League and the New York Pro Football League.
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