On this week’s episode of the Better Rivals podcast, Scheme Month rolls on! Defense is again in the spotlight as we move to the secondary and talk coverages. What is single-high coverage and why are we expecting to see it from the 49ers this season? Which position is the key to making everything go in the secondary? And how will San Francisco’s defensive backs fare in this transition? All that, plus which 49ers would be most valuable on the open market, Eric Reid vs. Jaquiski Tartt, and something about butts.