There are many reasons why products are not sorted according to brand.Slotting is a term used to describe the process by which SKUs are designated to specific forward pick locations. Slotting is based on volumetrics (velocity) and in more advanced systems (not sure if BB.com is doing this or not) which SKUs most commonly are paired together to complete the most orders.The goal of proper slotting is to separate your fast movers from your slow movers and reduce the travel time for the pickers, allowing them to fulfill more orders in less time. Travel time is easily the biggest time factor in completing an order.I used to be a supply chain engineer/consultant and have visited many distribution centers all over the US. I'd love to pay a visit to one of the Bodybuilding.com centers and see how they do things relative to the facilities that I've done work for in the past.