Walmart has their scans, so they know the previous year's data (as well as every year before that).
Initial Powerade distributions were sent to all stores, as the packages arried from KO production to WMT warehouses. Some were simply one time buys, with sufficient display space for proper sell-through.
CCE is basically out of the loop, so to speak, when it comes to Powerade in WMT stores. Financial compensation is given to CCE by KO for each case sold in WMT, though (don't know the numbers).
WMT has committed to doubling Powerade sales this year. I believe the same results could have been easily accomplished by CCE's people, if the same display space they WMT is now giving to Powerade had been given to CCE in the past, and going forward.
Unless proper inventory levels are maintained at a DC level, WMT Powerade failures are WMT failures. Not CCE, not other bottlers, not KO.