Logistics consultants are usually engaged to deliver a specific outcome and should utilise innovation as well as relevant experience and a track record in solving issues like yours. Consultants will tackle the assignment according to their own personal style, knowing what works best.
An additional significant advantage of engaging a consulting firm is that they will have a team of specialists to draw upon as the need arises, which effectively means more resources. A good consultant will not be afraid to challenge a client's preconceived notions or planned actions that need to be reassessed - all in a thoroughly professional and non-confrontational manner.