How can you say that? The NA are mainly ethnic Tadzhiks who speak no Pakistani dialects.
The Northern Alliance includes soldiers of Tajik, Uzbek and Hazara ethnic backgrounds, as well as a limited, but increasing number of Pashtuns.
As far as the rewards, OBL has had huge rewards on his head for years, with no results.
Because he hasnt appeared in front of crowds of 100s of thousands or even thousands. He will continue to refrain from doing that in order to stay alive.
This guy leveraged boxcutter knives into 5,000 dead under the rubble of the World Trade Center, he is a high concept thinker, and not likely to live out his life in caves.
Remember, a glorious death serving Allah is more rewarding to him than a longer life.
He's after maximum publicity for his cause of provoking World War Jihad, not a secure retirement package.
He won't get maximum publicity hidden in a cave.