Your looking at this to narrowly, if they can produce and ship that keeps there over head down along without having to pay for any long term storage. Next they don’t need to bottle everything them self’s, look's like to me they are making contracts and having distributors providing some of the bottling.
If you follow some of the smaller beer companies, what they’ll do is have one of the major brands do all there bottling, package and distribution for them, its really the only way to stay in business if you’re a smaller company. (Miller provides serves to about a half a dozen smaller companies) Now granite there getting there own machine, but if they can have some of there product bottled elsewhere…they can move it faster and cover more area in a shorter period of time… IMO