POWER RANKINGS: Is THIS the 49ers Year? Best/Worst Teams Entering Week 6 of the NFL Season

San Francisco 49ers surge to the NFL’s top spot as Kyle Shanahan’s offense and a resurgent defense set the standard in this season’s power rankings. Can any contender close the gap on a unit that’s top five in both DVOA offense and defense? The battle for the next tier heats up: Are the Buffalo Bills’ explosive offense and rebuilding defense enough to edge out the Seattle Seahawks, Jacksonville Jaguars, Kansas City Chiefs, and Baltimore Ravens?