The Falcons have given up decent fantasy days to power running backs in every game this season (Rashard Mendenhall, Tim Hightower, Pierre Thomas, Frank Gore, and Peyton Hillis). How will they handle changing gears and dealing with a shifty speed guy like LeSean McCoy?
In their last game against an especially quick back, the Falcons gave up 79 yards and two touchdowns to a barely-used Reggie Bush in late 2009.
McCoy has averaged 117 yards from scrimmage and a touchdown this year, taking on the dual-threat role in Andy Reid's offense that Brian Westbrook excelled at for years.
Despite injury concerns last week, he still ran for 92 yards and caught another 46 against the 49ers.
If speedy linebacker Sean Weatherspoon misses another game (as he might), the Falcons will have an even bigger challenge in containing McCoy.