While Matthew Stafford had an MVP season last year for the Los Angeles Rams, it wasn’t just the passing game that thrived, but also the running game. When Stafford joined the Rams, he played with one 1,000-yard rusher in his career. He played with just 11 individual 100-yard rushers with the Detroit Lions.  Last season was a testament to what can happen when Stafford has a top running game. The Rams averaged 0.21 rushing EPA per play as an offense with a rushing success rate of 50.1 percent. In fact, the gap between the Rams at one with a rushing success rate of 50.1 percent and the Buffalo Bills at two with a rushing success rate of 46.6 percent was slightly more than the gap between the Bills at two and the Green Bay Packers at nine.  The duo of Kyren Williams and Blake Corum turned out to be the 1-2 punch at running back that the Rams needed. While neither is a home-run hitter, Corum provides more shiftiness at the second level. Keeping Williams fresh allowed him to remain incredibly efficient .…