USA TODAY Sports

We loved so many of new Los Angeles Chargers head coach Jim Harbaugh's coaching hires.

And then came Marc Trestman.

The ill-fated one-time Chicago Bears head coach had heretofore been in NFL exile for seven years, after he was unceremoniously booted from his perch following a 13-19 stretch over two seasons with the Monsters of the Midway, and a subsequent brief stint for -- you guessed it -- the team led by Jim Harbaugh's brother John, the Baltimore Ravens, in 2015-16.

Trestman's biggest coaching success has happened far beyond the purview of the NFL gridiron. He's won three Grey Cup championship titles in the Canadian Football League, in 2009-10 and '17, while coaching the Montreal Alouettes and, post-NFL, the Toronto Argonauts.

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