By that same premise, a tribe being pounded upon by such a dominating force can not last forever; and the ground lost by MOJO/BoM to date is an undeniable detriment for them, while simultaneously assisting those attacking. An offhanded way of looking at this would be to imagine two bodies of individuals marked at 50% against one another. For whatever reason, one side gets the better of the other and a single percent of the opposing body is defeated; now that wouldn't be so bad, if it weren't for the fact that the one percent lost is not 'lost' but physically becomes part of the other body. Making it look like this: 51% vs 49%. Now obviously this example is single minded in its approach and does not include any outside factors, or for that matter the local environment; but, it does serve to illustrate the difficulty that a tribe might face when another gains an advantage over them.