You don't need a surplus to establish a hierarchy, you need a deficit. Deficit creates the need for structuring. If you're in a band and you can't get enough food to survive, there's going to be some tough decisions to be made. Who gets a cut and who doesn't is decided by those in power.
Besides that, I don't think it's absolutely necessary for a hunter gatherer band to be migrationary, that's only when a tribe becomes too big and exploits its territory faster than the territory can recover.
Besides that, I don't think it's absolutely necessary for a hunter gatherer band to be migrationary, that's only when a tribe becomes too big and exploits its territory faster than the territory can recover.