Shrunken Jacob has super strength! All of the littles in the Brothers Apart related AUs have greater proportional strength than a human; this is why Sam and Dean in Brothers Lost can haul each other around like kittens. Jacob, however, has even more strength than that. It helps a ton that he can carry supplies that the others would have to leave. He can also open Tupperwares when they go to raid the kitchen, leaving a wider variety of food available for his family.