That seems like an odd arrangement. Do you know any details about it?
I guess Coca Cola and Pepsi care about their image presented in the soda aisle so they manage it themselves?
I work for a supermarket currently (Publix in Florida) and work stock, Pepsi and Coke are responsible for those types of displays.
Because Pepsi and Coke (Frito Lay and a variety of other companies) don't sell to us like other manufactures and deliver their products themselves, they have vendors that come in and work their products to the shelves, maintain quality, and appearance. Most companies have people who rotate through the stores monthly or quarterly to check on their products but Frito Lay, Coke, Pepsi, bread companies, and certain frozen products have a vendor that comes in 5-6 days a week to check on their products.
Our stock clerks are responsible to refill the product from what we vendors have left over after deliveries or before they come in, if there is a sale going on and we run low. I think its set up that way for the companies to make more money and ensure we don't shortcut them, as we have our own brand as well.
And all those displays are built by those companies, as well as torn down. I think we are given choices by the vendors and what we decide on they come in and build. We've done Easter, NFL, our company logo, and Halloween displays at my store.