"There were a lot of situations where he was kind of seeing what we were doing and making adjustments," linebacker Paul Kruger added.
If those testimonials sound familiar, it's because Rivers has made it a habit of outfoxing defenses at the line of the scrimmage.
When offensive coordinator Frank Reich first arrived in San Diego as quarterbacks coach in 2013, he was immediately struck by Rivers' intelligence.
"I knew he was an elite passer, but I didn't realize this was one of the smartest football guys in the NFL, bar none," offensive coordinator Frank Reich raved last year. "If there is a top-10 list of smartest guys in the league, he's on it, promise you. ... He just sees it faster than anybody else."