NFL coaches are typically branded offensive gurus by having players fit their system. Think of Bill Walsh and the West Coast Offense. But the calling card for San Diego Chargers head man Mike McCoy is versatility: His system changes to fit his players.

In 2011, as offensive coordinator in Denver, McCoy altered his attack in midseason to fit Tim Tebow's run-first style. The next year, that plan was scrapped so a rusty Peyton Manning could have one of his best seasons. This season, his first as a head coach, McCoy has restored...