"All he has to do is play hard here," McMahon said via the Chicago Sun-Times. "If he plays hard, people understand that. They're very knowledgeable fans. They'll love him if he plays hard.
"And if he plays hard and wins, they'll love him forever."
It's an emphatic statement by McMahon, but it's one that's arduous to argue.
Football fans in Chi-Town still recall -- at least in name -- Sid Luckman. Luckman won a quartet of NFL Championships, but he retired in 1950 and passed away in 1998.
Just like McMahon in '85, Trubisky is a quarterback on a team that's identity is linked to a dominant defense. In contrast, McMahon played for the legendary Mike Ditka, who favored a more deliberate offense than the current Bears employ under Matt Nagy.
"[Trubisky has] got a great offense to play in, from the little bit that I've seen," McMahon said Friday. "That's the kind of offense I would like to play in. I know coach Nagy came from the Chiefs with Andy Reid, and Andy Reid was my tackle [at BYU]. So I've known him forever."
Times have changed.
McMahon's college tackle is coaching the AFC's most high-octane team and Chicago's most renowned football team celebrated its silver anniversary long ago.
No matter how the autumns pass in Chicago, though, the rare winning quarterback will be remembered for years to come.