Look at the Super Bowl champion Philadelphia Eagles. They have the blue print of what a Super Bowl team roster should resemble. The Eagles have a surplus of front 7 defenders that are extremely talented, and 4 serviceable defensive backs. On offense, they built an elite offensive line, drafted a top-tier quarterback and brought in a great back-up, and they rotate 3 cost-effective backs. In total, the Eagles entire running back room costs less than $3 million dollars.
If you want to win a Super Bowl you must invest in a quarterback, people to protect said quarterback, and find players to get after the other team’s quarterback.